Preparation of desa-9-en-5-one steroids

ABSTRACT

This invention is directed to processes for the preparation of desA-androst-9-en-5-ones and desA-pregn-9-en-5-ones which comprises subjecting the corresponding androst-4-en-one or pregn4-en-3-one respectively to the sequential steps of ozonolysis pyrolyzation, halogenation and dehydrohalogenation. The intermediate products produced in accordance with the processes of this invention can be converted into steroid end products of the 9 Beta , 10 Alpha -series which are pharmacologically useful as anabolic and progestational agents.

United States Patent Uskokovic [4 1 May 30, 1972 PREPARATION OF DESA-9-EN-5-ONE STEROIDS Inventor: Milan Radoje Uskokovic, Upper Montclair, NJ.

Assignee: Hoffman-La Roche Inc., Nutley, N.Y.

Filed: June 17, 1968 Appl. NOJ 737,362

Related U.S. Application Data Division of Ser. No. 499,094, Oct. 20, 1965, Pat. No. 3,574,761, which is a continuation-in-part of Ser. No. 400,206, Sept. 29, 1964, Pat. No. 3,412,107.

U.S. Cl ..260/338, 260/340.3, 260/340.5, 260/340.7, 260/340.9, 260/343, 260/343.5, 260/343.6, 260/343.9, 260/345.9, 260/476 C, 260/485 L, 260/491, 260/456 R, 260/455 R,

260/586 H Int. Cl. ..C07d 11/00 Field of Search ..260/586 H, 340.3, 338, 340.5,

260/345.9, 476 C, 485 L, 491, 340.7, 343, 343.5, 343.6, 343.9, 455 R, 340.9

[5 6] References Cited OTHER PUBLICATIONS Noller, Chemistry of Organic Compounds, 3rd Edition, pg. 198, 1965).

Caspi et al., Journal of Organic Chemistry, Vol. 26, pp. 3894- 3898 (1961).

Djerassi, Steroid Reactions, pp. 180- 189, 213- 217, and 222 1963).

House, Modern Synthetic Reactions, pp. 144- 15 6 1965 Primary ExaminerBemard l-lelfin Assistant ExaminerGerald A. Schwartz Attorney-Samuel L. Welt, Jon S. Saxe, Bernard S. Leon and William H. Epstein [5 7] ABSTRACT 23 Claims, No Drawings PREPARATION OF DESA-9-EN-5-ONE STEROIDS RELATED APPLICATIONS This application is a division of applicants copending application- Ser. No. 499,094, filed Oct. 20, 1965, now U.S. Pat. No. 3,574,761 entitled INTERMEDIATES AND PROCESSES, which is a continuation-in-part of applicats copending application Ser. No. 400,206, filed Sept. 29, 1964, now US. Pat. No. 3,412,107 entitled INTERMEDIATES AND PROCESSES.

DETAILED DESCRIPTION OF THE INVENTION This invention relates to novel chemical intermediates and processes useful in the preparation of steroids. Natural steroids possess a 9a,l0B-stereochemical configuration. Steroidal compounds possessing the unnatural 9B, lOa-configuration represent a pharmaceutically valuable class of compounds which, even though numerous members are known in the art, cannot be obtained by totally classical chemical means. In fact, the only known methods for obtaining steroids possessing the unnatural 9,8,1 Oct-configuration involve at least one photochemical reaction. Such photochemical reactions involve irradiation with ultraviolet light of strong intensity for long periods of time and, in comparison with purely chemical reactions, are very inefficient and give only small yields.

It is an object of the present invention to provide intermediates and processes which enable the preparation of 9/3,lOa-steroids without the necessity of proceeding through a photochemical reaction. It is also an object of this invention to provide novel intermediates and processes which will enable the further exploration of steroids having the unnatural 9B,]Oa-c0nfigurati0n. It is also an object of this invention to provide novel 93, l Oar-steroids.

The novel intermediates and processes of this invention are valuable and provide anew synthetic route completely of a classical chemical nature, i.e. involving no photochemical reaction, for converting steroids having the normal configuration into steroidal compounds possessing the unnatural 9B,l0a-configuration. v

In one aspect, the novel intermediates and processes of this invention enable the preparation of 9/3,.1 Oa-steroidsof the androstane series of the formula the group consisting of hydrogen, lower alkyl, hydroxy and lower alkanoyloxy; Y is selected from the group consisting of hydrogen and lower alkyl and X is a substituent in the 6- or 7- position selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, lower alkanoylthio and halogen.

Compounds of formula I are useful as anabolic agents.

Other 9/3, I Oa-androstanes, the preparation of which is enabled by the intermediates and processes of this invention, are of the formulas IInC Ilh "lower nllmnyl \l/ Mn H30 E l H it 0 X 10 II I I "lower alkynyl MR3 me ll E 1% II II X Y 111 wherein R,, R Y and X have the same meaning as above. Compounds of formula III are useful as progestational agents and compounds of formula II are useful as anti-androgenic agents.

In another embodiment of this invention, the novel compounds and intermediates provided by this invention enable the preparation of 9fi,l0a-steroids of the l7B-pregnane series of the formula I -wR' I139 5 H II it I X 40 Y W 1 wherein Y and X have the same meaning as above; R is selected from the group consisting of hydrogen, lower alkyl, fluoro, hydroxy and lower alkanoyloxy; R is selected from the group consisting of hydrogen and'halogen; and R is selected from the group consisting of hydrogen,

lower alkyl, hydroxy and halogen. Compounds of formula IV are useful as progestational agents. Other 9B,]Oa-steroids of the l7/3-pregnane series, preparable from the novel compounds and process of this invention, are of the formula CH2OH 5:0 I 0:

. V wherein R';,, R,,, Y and X have the same meaning as above. Compounds of formula Vv are useful as salt-retaining agents, i.e. are useful inthe treatment of Addison 5 disease.

As used herein, the term lower alkyl comprehends both straight and branched chain saturated hydrocarbon groups, such as methyl, ethyl, propyl, isopropyl and the like. Similarly, the term lower alkanoyl comprehends groups such as acetyl and the like, and the term lower alkanoyloxy comprehends groups e.g. formyloxy acetoxy and the like. In the same manner, the term lower alkenyl comprehends groups such as vinyl and the like, and the term lower alkynyl comprehends groups such as ethiny] and the like. Halogen comprehends all four halogens, i.e. iodine, bromine, chlorine and fluorine.

The expression l7B-OH, l7a-lower alkanoic acid lactone)" refers to a configuration on the C-l7 carbon atom illustrated as follows:

wherein W is lower alkylene, e.g. polymethylenes such as ethylene, propylene or the like.

With respect to substituents in the 6- and 7-position, preferred compounds are those having hydrogen or lower alkyl in 6- or 7-position, and those having halogen in the 7- position.

In one aspect, this invention comprises a method for the preparation of 9B,10a-androstanes of formulas llll and of 9,8, la-l7fl-pregnanes of formulas IV-V which comprises the hydrogenation of desA-androst-9-en-5-ones or of desA- 17/3-pregn-9-en-5-ones to 913,10B-d'esA-androstan-5-ones or QBJOB-desA-l7Bpregnan-5-ones, respectively, followed by condensation with a lower alkyl vinyl ketone with methyl or ethyl vinyl ketone preferred (as well as, substitutes therefor such as l-tertiary amino-3-butanone, l-tertiary amino-3-pentanone and quaternary ammonium salts thereof), l-Q-butan- 3-one, l-Q-butan-3-one lower alkylene ketal, l-Q-butan-3-ol, esterified l-Q-butan-3-ol, l-Q-butan-3-ol ether, 1,3-dichlorobut-Z-ene, l,3-dichloropent-2-ene, l-pentan-3-one, l- Q-pentan-B-one lower alkylene ketal, l-Q-pentan-S-ol, esterified l-Q-pentan-3-ol or l-Q-pentan-3 -ol ether, which condensation yields the desired 9B,lOa-steroids. The symbol Q is bromine, chlorine or iodine, with the former two being preferred. This invention also provides a number of different methods for the preparation of said desA-androst-9-en-5-one or desA- l 7B-pregn-9-en-5-one starting materials from natural steroids.

in one embodiment, a steroid of the 3-oxo-androst-4-ene or 3-oxol 7/3-pregn-4-ene series is subjected to an oxidative ring opening of the A-ring yielding a -oxo-3,5-seco-A-norandrostun-3-oic acid or a 5-oxo-3,5-seco-A-nor-l7B-pregnan-3- oic acid, which 3-oic acid can then be converted to a mixture of a \Oa-desA-androstan-5one and a lOB-desA-androstan-S- one or a mixture of a l0a-desA-l7/3-pregnan-5-one and a lOfi-desA-l7B-pregnan-S-one. The conversion of the, 3-oic acid to the desA-compound can be effected either by pyrolysis of a salt of said 3-oic acid or via the enol lactone, i.e. a 4-oxoandrost5-en-3-one or a 4-oxo-17,8-pregn-5-en-3-one, which upon reaction with a Grignard reagent gives an aldol, which in turn can be converted into the desired desA-compound. The desA-compound can then be converted into the starting material desA-androst-Q-en-S-one or desA-l 7B-pregn-9-en-5- one via a two-step sequence of halogenation and dehydrohalogenation.

in another embodiment of this invention, desA-androst-9- en-5-one or desA- l 7B-pregn-9en-5-one starting materials can be prepared from 1 l-hydroxy steroids of the 3-oxo-androst-4- ene or 3-oxo-l 7B-pregn-4-ene series. This can be effected in a variety of ways. In one approach, an ll-hydroxy group of a steroid of the 3-oxo-androst-4-ene or 3-oxo-l7,8-pregn-4-ene series is converted into a leaving group, for example, a sulfonic acid ester or carboxylic acid ester. Oxidative ring opening of the A-ring of the thus formed ll-(esterified hydroxy)- containing compound yields the corresponding ll-(esterified hydroxy)-5-oxo-3,S-seco-A-norandrostan-3-oic acid or 1 l- (esterified hydroxy)-5-oxo-3,5-seco-A-norl 7B-pregnan-3-oic acid which upon pyrolysis of a salt of said 3-oic acid yields the desired desA-androst-9-en-5-one or desA-l7B-pregn-9-en-5- one starting material.

A further approach involves formation of an ll-hydroxydesA-androstan-S-one or 1 l-hydroxy-desA- l 7B-pregnan-5- one from an 1 l-hydroxy steroid of the 3-oxo-androsb4-ene or 3-oxol 7B-pregn-4-ene series via an oxidative ring opening of the A-ring of said ll-hydroxy steroid which yields an 11- hydroxy-S-oxo-A'nor-3,5-secoandrostan-3-oic acid 3,! Mactone or an 1 l-hydroxy-5dxo-3,5-secol 7B-pregnan-3-oic acid 3,1 llactone which, in turn is converted into a salt of the corresponding keto acid which salt upon pyrolysis gives the l lhydroxy-desA-androstan-5-one or I l-hydroxy-desA-l 7B- pregnan-S-one. Esterification of the l l-hydroxy moiety of the so-obtained compound with an acid moiety yields an 1 l- (esterified hydroxy)-desA-androstan-5-one or an 1 l- (esterified hydroxy)-desA-l 7B-pregnan-5-one which upon elimination of the leaving group (i.e. the esterified hydroxy moiety) gives the desired desA-androst-9-en-5-one or desA- l7B-pregn-9-en-5-one starting material. Though, in the above reaction sequence either 1 la-Ol-I or 1 13-0}! starting mate rial steroids can be used, it is preferred to use Ila-OH starting materials.

As will be appreciated from the above discussion, neither the specific reaction steps nor the reaction sequences of this invention involve any modification of substituents found in the l6-and/or l7position of the starting material natural steroids. However, in order to obtain unnatural 9B, IOa-steroids of formulas I-V, it is necessary or desirable to protect certain of the l6-and/or' l7-substituents against one or more of the reaction steps involved. It is also convenient to initially protect such a substituent in the starting material natural steroid and maintain the substituent in its protected form throughout the entire reaction sequence, regenerating the desired substituent only when the steroid of formulas I-V possessing the unnatural 9B,]Oa-configuration is obtained. On the other hand, it is sometimes convenient to insert a protecting group only before a certain reaction step or sequence of reaction steps. Said protecting group can then be maintained until the final reaction step or can be split off at some intermediate stage. The protecting groups can be inserted and split off by means know per se. The desirability of having protecting groups present will be further discussed below when the specific reaction steps are discussed in detail. The various substituents which are susceptible to being protected are exemplified by the 16- hydroxy group in a compound of any of formulas l-V, the 17B-hydroxy group in a compound of any of formulas [4, the l7a-hydroxy or 20-oxo group in a compound of any of formulas lV-V, the 2 1 -hydroxy group of a compound of formula V or the l7-oxo group of a compound of formula I.

The l7-oxo or 20-oxo group is suitably protected by ketalization, i.e., by reaction with a lower alkanediol, to yield a l7-lower alkylene dioxy or 20-lower alkylene dioxy compound, i.e., a l7-ketal or a ZO-ketal.

The l6-hydroxy, l7a-hydroxy, l'lfi-hydroxy or 2l-hydroxy moieties can be protected by esterification and/or etherification of the hydroxy group. Any available acid which will form an ester that can subsequently be hydrolyzed to regenerate the hydroxy group is suitable. Exemplary acids useful for this purpose are lower alkanoic acids, e.g. acetic acid, caproic acid, benzoic acid, phosphoric acid and lower alkane dicarboxylic acids, e.g. succinic acid. Also, protection for the la-hydroxy, l7a-hydroxy, or 2l-hydroxy substituent can be effected by forming the lower alkyl ortho ester thereof, i.e. l6a,17aor 2l-lower alkyl ortho esters. A suitable ether protecting group is, for example, the tetrahydropyranyl ether. Others are arylmethyl ethers such as, for example, the benzyl, benzhydryl and trityl ethers, or a-lower alkoxy-lower alkyl ethers, for example, the methoxymethyl, or allylic ethers.

In compounds containing the dihydroxyacetone side chain at C-17 (for example, compounds of formula V wherein R, is hydroxy), the side chain at C1 7 can be protected by forming the 17,20; 20,2l-bis-methylenedioxy group or by forming a 17,21-acetal or ketal group, or by forming a l7,2l-diester. The i7,2l-acetal or ketal and 17,2l-diester hinder. the 20- ketone group and minimize the possibility of its participating in unwanted side reactions. On the other hand, the l7,2Q;20,2l-bis-methylenedioxy derivatives actually convert the ketone to a non-reactive derivative. When both a 16ahydroxy and l7a-hydroxy substituent are present, these groups can be protected via formation of a l6a,l7a-acetal or ketal. The various protecting groups mentioned above can be removed by means known per se, for example, by mild acid hydrolysis.

ln compounds wherein there is present neither a 17:1- hydroxy nor 2 l-hydroxy substituent but there is present a 20 oxo group, the 20-oxo group can be protected via reduction to the corresponding carbinol (hydroxy) group. Thus, for example, the l7-acetyl side chain can be protected via conversion to a l7-(a-hydroxy-ethyl)-side chain. Regeneration of the l7- acetyl side chain can be simply effected via conventional oxidation means, for example, via oxidation with chromium trioxide in an organic solvent such as glacial acetic acid. Similarly in compounds containing a lfl-oxo, this group can be protected by reduction to .the corresponding carbinol (hydroxy) group. Thus, the l7-oxo group can be reduced to a l7fl-OH, l7a-H moiety, from which, when desired, the l7-oxo moiety can be regenerated by oxidation, as described above. Furthermore, a ZO-hydroxy or l7B-hydr0xy group, can itself be protected by esterification, for example, with a lower alkanoic acid such as acetic acid, caproic acid, or the like; or by etherification with moieties such as tetrahydropyranyl, benzyl, benzhydryl, trityl, allyl, or the like.

The 1601-1701 or l7a,2l-acetals and ketals above discussed can be formed by reacting l6a,l7a-bis-hydr0xy or 1711,21- bis-hydroxy starting materials with an aldehyde or a ketone; preferably it is done by reacting a simple acetal or ketal (i.e. a lower alkylene glycol acetal or ketal of a suitable aldehyde or ketone) with the moieties sought to be protected.

Suitable aldehydes and ketones include lower alkanals of at least two carbon atoms, such as paraldehyde, propanaland hexanal; di(lower alkyl)ketones, such as acetone, diethylketone, dibutylketone, methylethylketone, and methylisobutylketone; cycloalkanones, such as cyclobutanone, cyclopentanone and cyclohexanone; cycloalkyl (lower alkanals), such as cyclopentylcarboxaldehyde and cyclohexylcarboxaldehyde; cycloalkyl lower alkyl ketones, such as cyclopentyl propyl ketone, cyclohexylmethyl ethyl ketone; dicycloalkyl ketones, such as dicyclopentyl ketone, dicyclohexyl ketone and cyclopentyl cyclohexyl ketone; cycloalkyl monocyclic aromatic ketones, such as cyclohexyl P-chlorophenyl ketone, cyclopentyl O-methoxyphenyl ketone, cyclopentyl O,pdihydroxy-phenyl ketone and cyclohexyl m-tolyl ketone; cycloalkyl-lower alkyl monocyclic aromatic ketones, such as cyclopentylmethyl phenyl ketone; cycloalkyl monocyclic aromatic-lower alkyl ketones, such as cyclopentyl benzyl ketone and cyclohexyl phenethyl ketone; cycloalkyl-lower alkyl monocyclic aromatic-lower alkyl ketones, such as cyclopentylmethyl benzyl ketone; halo-lower alkanals, such as chloral hydrate, trifluoroacetaldehyde hemiacetal, and heptafluorobutanal ethyl hemiacetal; halo-lower alkanones, such as l,l,l-trifluoroacetone; monocyclic carbocyclic aromatic aldehydes, such as benzaldehyde, halobenzaldehydes (e.g. pchlorobenzaldehyde and p-fluorobenzaldehyde), lower alkoxy-benzaldehydes (e.g. o-anisaldehyde), di(lower alkoxy)benzaldehydes e.g. veratraldehyde), hydroxybenzaldehydes (e.g. salicylaldehyde), lower alkyl benzaldehydes (e.g. mtolualdehyde and p-ethylbenzaldehyde), di(lower alkyl)- benzaldehydes (e.g. O-p-dimethylbenzald ehyde); monocyclic carboxylic aromatic lower alkanals, such as phenylacetaldehyde, a-phenylpropionaldehyde, B-phenylpropionaldehyde, 4-phenylbutyraldehyde, and aromatically substituted halo, lower alkoxy, hydroxy and lower alkyl cyano derivatives thereof; monocyclic carbocyclic aromatic ketones, such as acetophenone, a,a,atrifluoroacetophenone, propiophenone, butyrophenone, valerophenone, halophenyl lower alkyl ketones (e.g. p-chloroacetophenone and chloropropiophenone); (lower alkoxy) phenyl lower alkyl ketones (e.g. p-anisyl methyl ketone); di-(lower alkoxy) phenyl lower alkyl ketones; hydroxy-phenyl lower alkyl ketones; (lower alkyl)phenyl lower alkyl ketones (e.g. methyl p-tolyl ketone); di(lower alkyl) phenyl lower alkyl ketones (0,p-xylyl methyl ketone; benzophenone, and mono-or bis-substituted halo, lower alkoxy, hydroxy and lower alkyl derivatives thereof; monocyclic carbocyclic aromatic lower alkanones, such as l-phenyl-3-butanone and l-phenyl-4-pentanone, and aromatically substituted derivatives thereof.

Especially suitable are those aldehydes or ketones which, with the l6a,l7aor l7a,2l-bis-hydroxy grouping fonn an acetal or ketal group of the formula wherein P is individually selected from the group consisting of hydrogen and lower alkyl; Q is individually selected from the group consisting of lower alkyl and aryl; and P and Q taken together are lower alkylene. The term lower alkylene" comprehends polymethylene chains such as tetramethylene and pentamethylene.

In discussing the various starting materials, intermediates and end-products of'this invention, the various protecting groups discussed above will not necessarily be specifically mentioned; but it should be understood that mention of any substituent comprehends the various protected forms thereof, unless specifically mentioned to the contrary.

In one embodiment of this invention, compounds of formula I through V are prepared from 913, l OB-desA-androstan-S-ones or 9B, IOB-desA-pregnan-S -ones of the formula H3O H it X VI wherein X has the same meaning as above and D represents the carbon and hydrogen atoms necessary to complete the steroid D-ring, as well as the atoms in the substituents in the 16- and 17- positions, as defined in formulas l-V above. Thus, 9B,!Oa-androstanes of formula I can be prepared from 913,1OB-desA-androstan-S-ones of the formula H O R1 MR H l X "II wherein R R R and X have the same meaning as above. Similarly, 9B ,l0oz-androstanes of formula II can be prepared from 9B,]0B-desA-androstan-5-ones of formula Vlll and 9B,l0a-androstanes of formula II] from 9B,l0B-desA-androstan-S-ones of formula IX.

A, "lower alkenyl MR3 h II it u UM R: H X JW/ I wherein R R and X havethe same meaning as above.

Moreover, 9B,l0a-l7}3'pregnanes of formulas IV and V can be prepared from 95, l OB-desA-pregnan-S-ones of formulas X and XI, respectively.

The conversion of a 9B,lOfi-desA-compound of formula VI to a 913,10a-steroid of formulas I-V (i.e. VII- I, VIlI-+ II, IX III, X+IV and XI V) is effected by condensing the 93, I03 -desA-compound with a compound selected from the group consisting of lower alkyl vinyl ketone (as well as substitutes therefor such as l-tertiary amino-3-butanone, l-tertiary amino-B-pentan-one and quaternary ammonium salts thereof), l,3-dichlorobut-2-ene, 1,3-dichloropent-2-ene, l-Q butan-3-one, l-Q-butan-3-one lower alkylene ketal, 1-O- butan-3-ol, l-Q-butan-Il-ol ether, esterified l-Q-butan-S-ol, l- Q-pentan-3-one, ,l-Q-pentan-3-one lower alkylene ketal, l-Q- pentan 3-ol, l-Q-pentan-3-ol ether or esterified l-Qpentan-3- 01. Q is bromo, chloro or iodo, with the former two being preferred. Methyl vinyl ketone and l-tertiary amino-3-butanone are the preferred reagents, and the former is especially preferred. Prior to the condensation it is desirable to protect the -keto group present in compounds of formulas X and XI, then it is not necessary to protect I6a,l7a or 2l-hydroaty groups which are present, but groups protecting these moieties can be retained through the condensation reaction.

The above indicated substitutes for lower alkyl vinyl ketones are compounds wherein the vinyl moiety is replaced by a moiety of the formula N-CHz-CHr When a lower alkyl vinyl ketone or substitute therefor, l-Q- butan-S-one or l-Q-pentan-3-one is used as the reaction partner for the condensation, ring closure to ring A (containing a 3-oxo moiety) of the desired 95, lOa-steroid of formulas I-V occurs simultaneously with the condensation. However, when 1,3-dichlorobut-2-ene, l,3-dichloropent-2-ene, l-Q- butan-3-one lower alkylene ketal, l-Q-butan-3'ol, l-Q-butan- 3-01 ether, esterified 1-Q-butan-3-ol, l-Q-pentan-3-one lower alkylene ketal, l-Q-pentan-B-ol, l-Q-pentan-3-ol ether, or esterified l-Q-pentan-B-ol is used as the reaction partner a subsequent step to generate the 3oxo moiety is required. When l-Q-butan-3'ol or l-Q-pentan-3-ol is used as the reaction partner, the oxo moiety can be generated by oxidation and for this purpose, it is suitable to use oxidation means known per se, for example, chromic acid, chromium trioxide in acetic acid or the like. When esterified or etherified l-Q- butan-3-ol or esterified or etherified l-Q-pentan-3-ol is used as the reaction partner, hydrolysis of the esterified or etherified hydroxy groupshould be effected prior to oxidation. Suitable ester forming moieties are, for example, carboxylic acids, e.g. lower alkanoic acid such as, acetic acid, benzoic acid, and the like; and hydrolysis of the reaction products obtained by reacting such I-Q-butan-3-ol or l-Q-pentan-3-ol esters is suitably conducted by alkaline hydrolysis, e.g. via the use of an aqueous alkali metal hydroxide such as aqueous sodium hydroxide. Suitable ethers are, for example, lower alkyl ethers, i.e. 3-methoxy, 3-ethoxy or the like; and these are suitably hydrolyzed by acid hydrolysis, e.g. via the use of an aqueous mineral acid such as hydrochloric acid, sulfuric acid or the like. When a l-Q-butan-3-one lower alkylene ketal or a l-Q-pentan-B-one lower alkylene ketal is used as the reaction partner, mild acid hydrolysis of the ketal moiety results in generation of the 3-oxo moiety. Finally, when 1,3-dichlorobut-3-ene or l,3-dichloropent-3-ene is used as the reaction partner, the 3-oxo moiety can be generated by treatment with a concentrated mineral acid, preferably a strong acid such as hydrochloric acid or sulfuric acid. It should be noted, that 1,3- dichlorobut-Z-ene and l,3-dichloropent-2-ene may be used as reaction partners with compounds of formulas X and XI, but not with the l 7a-lower alkyl, alkenyl or alkynyl compounds of formulas VIII-IX. As will be apparent, when a reaction partner based on butane (i.e. having a four carbon atom skeleton) is utilized a compound of formulas l-V wherein Y is hydrogen is obtained. Similarly, when a reaction partner based on pentane is utilized a compound of formulas I-V wherein Y is methyl is obtained.

In addition to the preparation of compounds of formulas I-V from compounds of formulas VIXI by the use of the above mentioned reaction partners, it is also possible by the procedures of this invention to prepare compounds of formulas l-V which, in the A-ring, in addition to containing an unsaturation between the 4- and 5-positions also contain an unsaturation between the land 2-positions. Such 1,4-diene products corresponding to the compounds of formulas l-V can be prepared from compounds of formulas VI-Xl by condensation of the latter with a reaction partner selected from the group consisting of ethinyl methyl ketone and ethinyl ethyl ketone (as well as substitutes therefor such as fi-tertiary amino-vinyl methyl or ethyl ketone, quaternary ammonium salts thereof, and B-lower alkoxy-vinyl methyl or ethyl ketone). Condensation to prepare such a 1,4-diene product corresponding to the compounds of formulas I-V is effected under the same conditions as is the condensation to prepare a compound of formulas l-V. The so-obtained 1,4-dienes are useful in the same way as the correspondingly substituted 4- ene-compounds of formulas I-V.

The condensation is suitably effected at, below or above room temperature. For example, at the reflux temperature of the reaction medium or at ice temperature (0 C.) or below. Moreover, the condensation is suitably effected in an organic medium. Preferably the solvent is a lower alkanol, such as methanol, isopropanol, tert-butanol, ethanol, or another nonketonic organic solvent, such as an ether, e.g. dioxane, diethyl ether, diisopropyl ether, aromatic hydrocarbon, e.g. benzene,

toluene, xylene, organic acid, such as acetic acid, or the like. Lower alkanols are the preferred solvents. It is suitable to catalyze the condensation, and this can be effected via use of a catalyst such as alkali metal lower alkoxide, for example sodium ethoxide, potassium t-butoxide, sodium t-amylate, or the like, alkali metal hydroxide such as sodium, lithium or potassium hydroxide, a quaternary ammonium hydroxide, for example, a benzyl tri-lower alkyl ammonium hydroxide such as benzyl trimethyl ammonium hydroxide, para-toluene sulfonic acid, or the like. 10

When using a substitute for methyl or ethyl vinyl ketone, or for methyl or ethyl ethinyl ketone, the condensation should be effected under alkaline conditions. As indicated above, among such substitutes are l-tertiary amino-3-butanone, I-tertiary amino-3-pentanone and B-tertiary amino-vinyl methyl or ethyl ketone. Preferred tertiary amino groups are dilower alkylamino groups such as dimethylamino, diethylamino, pyrrolidino, piperidino, morpholino, or the like. Preferred quaternary ammonium salts of such tertiary amino groups are, for example, those formed from lower alkyl halides such as methyl iodide. An exemplary B-lower alkoxy vinyl methyl or ethyl ketone is B-methoxyvinyl ethyl ketone.

One aspect of this invention is the hydrogenation of desA- androst-9-en-5-ones or desA-pregn-9-en-5-ones to 93,10,8- desA-androstan-S-ones of formulas VII-IX or to 9/3,l0,8-desA- pregnan-S-ones of formulas X-Xl. Thus, 9B,l0B-desA-an-' drostan-S-ones of formula VII can be prepared via hydrogenation of desA androst-9-en-5-ones of the formulas H O R I 1 "R2 MB:

III H10 .0

X XII E30 R1 I --lower alkenyl X XIII lower alkynyl NWRa H I, E30

X XIV wherein R R R and X have the same meaning as above. Also, 9B,l0,B-desA-pregnan-5-ones of formulas X and XI can be prepared by hydrogenation of desA-pregn-9-en-5ones of the formulas CHQR XVI

wherein R R R,, and X have the same meaning as above.

Prior to hydrogenation, the C-20 keto group in compounds of formulas XV and XVI or C-l.7 keto group in compounds of formula XII should be protected either by conversion to the corresponding carbino or by ketalization as described above. The hydrogenation can, however, be effected without protecting such keto groups.

Moreover, it should be noted that the hydrogenation, besides inserting a hydrogen atom in each of the 9- and 10- positions, can also simultaneously effect hydrogenation of other groups in the molecule. For example, the C-20-keto group can be hydrogenated to the corresponding carbino] or the C-l7 lower alkenyl group in compounds of formula XIII or the C-l7 lower alkynyl group in compounds of formula XIV can be hydrogenated to the corresponding C-l7-lower alkyl compounds. Compounds of fonnulas VIII and IX can, in turn, be prepared from compounds of formula VII wherein R and R together are oxo via reaction with a lower alkenyl or lower alkynyl Grignard reagent, with prior protection of the 5- keto group, for example, by forming S-ketals without concurrent blocking ofthe l7-keto group. In the same manner compounds of formulas XIII and XIV can be formed from compounds of formula XII wherein R and R taken together are OX0.

The hydrogenation of desA-androst-9-en-5-ones of formulas XII-XIV and of desA-pregn-Q-en-S-ones of formulas XV-XVI is one of the main features of this invention. It is effected by catalytic hydrogenation, suitably using a precious metal-catalyst. Suitable precious metal catalysts are palladium, platinum, ruthenium, and rhodium, the latter two being especially preferred. It is particularly advantageous to use rhodium,v for. example, rhodium on charcoal (or carbon powder, carbon black, or the like) or rhodium on alumina. In contrast to-what would be expected, it has been found that such a catalytic hydrogenation of a compound of formulas XII-XVI gives a-substantial yield of a compound of formulas VI-XI. In fact, it has been found that such catalytic hydrogenation gives a major proportion of a compound of the formulas VI-XI. This catalytic hydrogenation is suitably effected in an inert organic solvent, for example, a lower alkanol such as methanol or ethanol, an ether such as dioxane or diglyme, a hydrocarbon such as cyclohexane, hexane, hexane, or the like. Lower alkanols are preferred solvents. Moreover, it is suitably conducted in the presence of an acidic or basic catalyst, for example, an alkali metal or alkaline earth metal hydroxide such as sodium hydroxide or the like, or a mineral acid, for example, a hydrohalic acid, such as hydrochloric acid, or the like, or an organic acid such as a lower alkanoic acid, for example, acetic acid. The reaction can be conducted at, above or below room temperature, for example, from about -5 C. to about C. However, it is preferably conducted at a temperature between about 0C. and about 35C.

As described above, the desA-androst-9-ene-5-ones or desA-l7,B-pregn-9-en-5ones of formulas XII-XVI can be prepared from natural steroids by a variety of methods. Thus, in one embodiment of this invention said desA-androst-Q-en- 5-ones or desA-l 7B-pregn-9en-5-ones can be prepared from steroids of the 3-oxo-androst-4-ene or 3-oxo-l7fi-pregn-4-ene series by a reaction sequence which involves as a first step an oxidative ring opening of ring A of the natural steroid. For this XVII wherein X isa substituent in the 6-position selected from the group consisting of hydrogen, lower alkyl, lower alkylthio and lower alkanoylthio or a substituent in the 7- position selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, lower alkanoylthio and halogen, and Z represents the carbon and hydrogen atoms necessary to complete the steroid D-ring, as well as the atoms in the substituents in the 16- and l7-positions as defined in formulas I, IV, and V above. The oxidative ring opening of a natural steroid of formula XVll yields a -oxo-3,5-seco-A-norandrostan-3-oic acid or a 5-oxo-3,5-seco-A-norpregnan3-oic acid of the formula X VIII the ozonolysis is advantageously conducted at below room temperature. Thus, it is preferably conducted at a temperature between about 70 C. and about 25 C. The resulting ozonides can be decomposed by conventional means, for example, by treatment with water, hydrogen peroxide in water, acetic acid or ethyl acetate, or the like. The oxidative ring opening of a compound of formula XVll to a compound of formula XVlll can also be effected by other oxidation means, for example, by treatment with hydrogen peroxide. It should be noted that an oxidative ring opening by either ozonolysis or by treatment with hydrogen peroxide, does not require protection of any of the substituents at C-1 6 or C-l 7. However, as stated above, it may be desirable to protect these substituents against some subsequent reaction in the total reaction sequence being practiced. On the other hand, the oxidative ring opening can also be effected by oxidation with chromium trioxide or via treatment with sodium periodate and potassium permanganate in potassium carbonate solution and if these oxidation means are used, it is necessary to protect any secondary hydroxy groups which might be present such as a l6,l7,8- or 2l-hydroxy group; preferably, for the purpose of this reaction, with non-aromatic protecting groups.

Following the oxidative ring opening of the A-ring, the soobtained 5-oxo-3,5-seco-A-norandrostan-3-oic acid or 5-oxo- 3,5-seco-A-norpregnan-3-oic acid of formula XVlll is converted into a mixture of a IOa-desA-androstan-S-one and a lOB-desA-androstan-S-one or a mixture of a IOa-desA- pregnan-S-one and a lOB-desA-pregnan-S-one as illustrated below:

XVIII alkali metal salt of XVIII i E fn H H H XIX XX wherein in formulas XIX and XX, X and Z have the same meaning as above.

The compounds of formula XlX are IOa-desA-androstan-S- ones or l0a-desA-pregnan-5-ones, depending on the meaning of Z, and the compounds of formula XX are IOB-desA-am drostan-S-ones or IOB-desA-pregnan-S-ones. The conversion of a compound of formula XVlll into the compounds of formula XlX and XX is effected by pyrolysis. In effecting the pyrolysis, it is desirable to convert the 3-oic acid of formula XVIll into a corresponding metal salt, for example, an alkali metal salt such as the sodium or lithium salt. This conversion to a metal salt can be effected prior to pyrolysis, e.g., by treating the acid with sodium hydroxide or in situ during the course of the pyrolysis, e.g., by fusing the 3-oic acidwith a mixture of sodium acetate and potassium acetate. The pyrolysis can be conducted at atmospheric pressure or in a vacuum. One preferable embodiment is to conduct the pyrolysis in a vacuum, at a temperature from about 200 C. to about 350 C. in the presence of a proton acceptor, e.g. an alkali metal or alkaline earth metal salt of a weak organic acid, for example, potassium acetate, sodium acetate, sodium phenyl-acetate, sodium bicarbonate, or the like; especially preferred is a vacuum of from about 0.001 to about 0.5 mm. Hg. Accordingly, it is advantageous to conduct the pyrolysis under alkaline conditions, i.e. at a pH greater than 7. The pyrolysis can be effected in solution or by fusion. An especially preferred method of effecting the pyrolysis is by fusion of an alkali metal salt of a weak acid, for example, an organic carboxylic acid such as a lower alkanoic acid or a phenyl-lower alkanoic acid such as phenyl-acetic acid. Another method of effecting the pyrolysis is to heat, preferably at atmospheric pressure, a solution of an alkali metal salt, such as the sodium or lithium salt,

of a 3-oic acid of formula XVlll in a basic organic solvent. The basic organic solvent should, of course, be one which is in the liquid state at the temperature at which the pyrolysis is effected. Thus, the pyrolysis can be effected at a temperature up to the boiling point of the basic organic solvent being used. Suitable basic organic solvents are, for example, nitrogen containing organic solvents such as piperidine, pyridine, isoquinoline, quinoline, triethanolamine, or the like. When utilizing this approach using a basic organic solvent it is suitable to heat to temperature between about 200 C. and about 300 C., and preferably between about 230 C. and about 260 C. A preferred basic organic solvent for the pyrolysis of a salt of a compound of formula XVIll to compounds of formulas XIX and XX is quinoline. If a basic organic solvent is used which boils substantially below 200 C. at atmospheric pressure, it is suitable to conduct the pyrolysis in a sealed tube or an autoclave.

In another aspect, compounds of formula XIX can be prepared from compounds of the formula Z II X XIX A wherein X andZ have the same meaning as above. The compounds of formula XIX can be prepared from compounds of formula XIX A in the same manner that compounds of formula XIX are prepared from compounds of formula XVII, i.e. by oxidative ring opening of the A-ring of a compound of formula XIX A followed by elimination of the residue of the A-ring, to yield a compound of formula XIX. The oxidative ring opening of the compound of XIX A can be performed by ozonolysis as described above for the conversion of a compound of formula XVII to a compound of formula XVIII. Such ozonolysis of a compound of formula XIX A yields a compound of the formula XIX B wherein X and Z have the same meaning as above, and A is carboxy or formyl.

A compound of formula XIX B can then be converted to a compound of formula XIX. This removal of the residue of the A-ring, i.e. decarboxylation and deforrnylation, can be effected by heating in an acidic or basic medium. It is preferred to heat to the reflux temperature of the medium which is preferably an inert organic solvent such as a lower alkanol, e.g. ethanol, dioxane, ether or the like. The decarboxylation and deformylation yields mainly a compound of formula XIX, but also a minor yield of the corresponding lOB-isomer of formula XX.

Compounds of formula XIX can also be formed from a compound of formula XVIII via the formation of an enol-lactone of a compound of formula XVIII, i.e. via the formation of a 4-oxo-androst-5-en-3-one or a 4-oxo-pregn-5-en- 3-one of the formula:

- XXI wherein X and 2 have the same meaning as above, which can then be reacted with a Grignard reagent, such as phenyl magnesium bromide or phenyl lithium, to form the resulting aldol of, for example, the formula 3, 03 XXII- wherein X and Z have the same meaning as above, which, upon treatment with an alkali metal hydroxide, such as potassium hydroxide, at an elevated temperature, for example, from about 200 C. to about 240 C., is converted to the corresponding IOa-desA-androstan-S-one or IOa-desA- pregnan-S-one of formula XIX.

It should be noted that though the pyrolysis of a compound of formula XVIII yields both the IOa-compounds of fonnula XX and the IOa-compounds of formula XIX, and though sodium ethoxide in an ethanol solution or sodium methoxide in a methanol solution.

The above-discussed conversion via the alkali metal salt and pyrolysis of compounds of formula XVIII to compounds of formulas XIX and XX can be effected without protection of any of the substituents which might be present at C-l6 or C'I7. However, if it is desired for either preceding or succeeding reaction steps of the total reaction sequence, the conversion of a compound of formula XVIII to compounds of formulas XIX and XX can be effected with protecting groupspresent on substituents in the C-l 6 or C-1 7 position.

As stated above, the IOa-desA-androstan-S-ones or desA-pregnan-S-ones of formula XIX or the IOB-desA-androstan-S-ones of lOB-desA-pregnan-S-ones of formula XX can be converted via a two-step sequence of halogenation and dehydrohalogenation into the desired starting material desA- androst-9-en-5-one or desA-pregn-9-en-5-one of formulas XII, XV, andXVI.

In a preferred embodiment a IOadesA-androstan-S-one or a lOa-desA-pre'gnan-S-one of formula XIX is subjected to the twostep sequence of halogenation and dehydrohalogenation. Halogenationof a compound of formula XIX or a compound of formula XX yields a mixture of corresponding halogenated compounds including one of the formula XXIII wherein X and 2 have the same meaning as above, and Hal is a halogen atom (preferably Br or Cl Dehydrohalogenation of a compound of formula XXIII then yields a desired starting material of formulas XII, XV and XVI. Keto groups except for the S-keto group, may require protection prior to the halogenation. In the case of compounds of formulas XIX and XX containing the C-l7 dihydroxyacetone side chain, represented in formula V wherein R is hydroxy, this protection can be effected by formation of the l7a,20;20,2 l-bis-methylenedioxy derivative. In other cases wherein a C-1 7 0x0 or C-20 0x0 group is present, protection can be effected by reduction to the corresponding carbinol either directly prior to the halogenation step or prior to some other step in the reaction sequence leading to the compounds of formulas XIX and XX.

The halogenation can be effected with halogenating agents such as bromine, sulfuryl chloride, or the like. Bromination is especially preferred. The bromination is suitably effected by treatment with bromine at room temperature or below, preferably at ice temperature or below. Suitably it is conducted in an organic medium; for example, an organic acid such as acetic acid; an ether such as an anhydrous ether, diox ane, tetrahydrofuran; a chlorinated organic solvent such as methylene chloride, chloroform, carbon tetrachloride; or the like; with the addition of hydrogen bromide as a catalyst. When effecting halogenation with sulfuryl chloride, it is suitable to use the same type of organic medium as when brominating; and suitable catalysts are, for example, acetic acid, benzoyl peroxide, or the like.

The subsequent dehydrohalogenation of a compound of formula XXIII is preferably conducted under mild dehydrohalogenating conditions; for example, by the use of an alkali metal carbonate (e.g. lithium carbonate) or an alkali -metal halogenide (e.g. a lithium halide) in an organic solvent such as a di-lower alkyl-formarnide, or with an organic base such as collidine, pyridine, or the like. The dehydrohalogenation is advantageously conducted at slightly elevated temperatures, for example, from about 50 C. to about 150 0, preferably from about 80 C. to about 1 20 C.

Separation of the desired product des-A-androst-9-en-5-one or despregn-9-en-5-one of formulas XII, XV and XVI can be effected by conventional means. As indicated above the halogenation procedure may result in halogenated byproducts in addition to the desired intermediate of formula XXIII. Accordingly, the separation is preferably effected after first subjecting the reaction mixture to dehalogenating conditions in order to dehalogenate the halogenated by-products formed by the halogenation procedure, but not dehalogenated by the dehydrohalogenation. Following such dehalogenation the reaction mixture can then easily be separated by conventional means, for example, by column chromatography, to yield the desired compound of formulas XII, XV, XVI. An examplary dehalogenation means is treatment with zinc and sodium acetate in an acetic acid solution at an elevated temperature, for example, about 80 C.

In the case of compounds of formulas XIX or XX which contain a halogen atom on a carbon atom directly adjacent to a k'eto group, it is preferable to protect such a halogen atom against dehalogenation prior to subjecting the compound of formulas XIX or XX to the two step sequence of halogenation and dehydrohalogenation of this embodiment. Such a grouping, containing a halogen atom on a carbon atom directly ad-,

jacent to a keto group, is illustrated in a compound of formulas IV or V wherein R and R is halogen. Thus, if 1004- or 103- desA-pregnan-S-one of formulas XIX or XX containing a 17aor ZI-halo substituent is to be subjected to the halogenationdehydrohalogenation sequence it is desirable to first effect protection of the l7aor 2 l-halo substituent. This protection can be effected, for example, by ketalization of the 20-oxo group.

As stated above, the desired desA-androst-9-en-5-ones or desA-pregn-9-en-5-ones starting materials can also be prepared from steroids of the 3-oxo-androst-4-ene or 3-oxol7B-pregn-4-ene series containing an I l-hydroxy substituent. In one embodiment an I l-hydroxy steroid of the formula V X XXIV wherein X and Z have the same meaning as above, is reacted with an acid or a reactive derivative thereof to form a leaving group in the ll-position. By reactive derivative is meant, for example, a halide, e.g. a chloride, an anhydride, or the like. Though either 113- or llahydroxy starting materials can be used, it is preferable to utilize a-hydroxy compounds of formula XXIV as starting materials. Prior to the esterification reaction, it is preferable to protect hydroxy groups present in the C- l. 6, Cl7;-'

or C-2l position. Suitable acids for the esterification of the l l-hydroxy group, which can be used to form a leaving group in the ll-hydroxy are inorganic acids such as phosphoric acid, organic carboxylic acids such as anthraquinone a-carboxylic acid or organic sulfonic acids, for example, toluene-sulfonic acids, especially ptoluene sulfonic acid, lower alkyl-sulfonic acids such as methane-sulfonic acid and nitrophenylsulfonic acids, especially p-nitrophenylsulfonic acid. Especially preferred as the leaving group in the ll-position is a lower alkylsulfonyloxy group such as the mesoxy group. However, when it is desired to react a compound of formula XXIV with a sulfonyloxy forming moiety, then a compound of fomiula XXIV having an I lot-configuration should be used as a starting material. The above described esterification of ll-hydroxy steroid starting materials of formula XXIV yields compounds of the formula wherein X, Z and LO have the same meaning as above.

The oxidative ring opening of the A-ring of a compound of formula XXV to a compound of formula XXVI can be effected by ozonolysis as described above for the oxidative ring opening of the A-ring of a compound of formula XVII to a compound of formula XVIII. Pyrolysis of the so-formed compound of formula XXVI under the conditions described above for the pyrolysis of a compound of formula XVIII to compounds of the formulas XIX and XX directly yields the desired des-A-androst-Q-en-S-one or desA-pregn-9-en-5-one of formulas XII, XV, XVI. Thus, pyrolysis of a compound of formula XXVI directly results in elimination of the leaving group in the l l-position as well as a splitting off of the residue of ring A attached to the IO-position. This procedure of starting from an I I-hydroxy steroid (preferably 1 lct-hydroxy) of formula XXVI and proceeding through intermediates of formulas XXV-and XXCI to compounds of formulas XII, XV, XVI, represents a particularly elegant procedure for preparing the latter compounds. An especially preferred method of effecting the pyrolysis of a salt of a 3-oic acid of formula XXVI is the method described above wherein the salt of the 3-oic acid is heated in a liquid basic organic solvent. Especially preferred solvents for the pyrolysis of a salt of a compound of formula XXVI are triethanolamine and quinoline.

As indicated in the foregoing paragraph the pyrolysis of a salt of a compound of formula XXVI involves two separate chemical attacks; one being the elimination of the ll-leaving group and the other being the splitting off of the A-ring residue. Instead of efiecting these two attacks simultaneously, as described above, it is also possible to effect them sequen- XXVI Ha? f U HOOC wherein X and Z have the same meaning as above.

The elimination can be efiected by any conventional elimination means. It is suitably conducted under alkaline conditions in an anhydrous organic solvent. Preferably, it is effected by heating, i.e. at a temperature between about room temperature and the reflux temperature of the reaction mixture. Thus, treatment of a compound of formula XXVI with either an inorganic or organic acid or base results in the formation of the desired compound of formula XXVIA. Preferably a weak base is used, for example, a salt of a carboxylic acid (e.g. a lower alkanoic acid) with an alkali metal or an alkaline earth metal, for example, sodium acetate, potassium acetate, or the like. As indicated, the elimination is suitably conducted in an anhydrous organic solvent; suitable are solvents such as dilower alkyl-formamides, e. g. dimethylformarnide, lower alkanoic acids, e.g. acetic acid, or the like. When a proton accepting solvent, such as dimethylformamide, is used, it itself can serve as the base for the purpose of this elimination reaction; i.e. if the solvent is basic then the elimination can be conducted without the addition of a separate basic material. Similarly, if the solvent is acidic, then the elimination can be conducted without the addition of a separate acidic material.

After the elimination is effected the A -seco acid product of formula XXVIA can then be converted to a salt, for example, an alkali metal salt, and the so-formed saltpyrolyzed according to the conditions described above for the pyrolysis of a compound of formula XXVI to compounds of formulas XII, XV and XVI.

After the above-described l l-leaving group elimination and A-ring residue splitting, conducted either simultaneously or sequentially, the desired desA-9-en-5-one compounds of formulas XII, XV and XVI can be isolated by conventional means. However, it has been found particularly suitable with compounds of formulas XV and XVI to isolate by forming the disemicarbazone of the pyrolysis product and then regenerating therefrom the desired 5,20-dione of formulas XV or XVI, or if the ZO-oxo group has been protected, for example, by reduction to a -hydroxy moiety, by forming the semicarbazone at the 5-position and then regenerating therefrom the desired S-one compound.

In yetanother embodiment of this invention starting material I I-hydroxy steroids of formula XXIV can be directly subjected to an oxidative ring opening of the A-ring by ozonolysis or treatment with hydroxide peroxide, as described above for the oxidative ring opening of the A-ring of a compound of formula XVII to a compound of formula XVIII. This oxidative ring opening of the A-ring of a compound of formula XXIV yields an ll-hydroxy-5-oxo-3,S-SecO-A-norandroStan-acid 3,l l-lactone or an I l-hydroxy-3-oxo-3,S-seco-A-norpregnan- 3-oic acid 3,l l-lactone of the formula XXVII wherein X and 2 have the same meaning as above.

XXVIA.

Treatment of the 3,1 l-Iactone of formula XXVII with an alkali metal hydroxide such as sodium hydroxide gives the salt of the same keto acid. Without isolation, this salt can then be subjected to pyrolysis yielding a mixture of an 1 l-hydroxyl 03 -desA-androstan-5-one and an I I-hydroxy-lOa-desA-androstan-S-one or a mixture of an 1 l-hydroxy-lOa-desA- pregnan-S-one and an ll-hydroxy-lOB-desA-pregnan-S-one, as illustrated below:

XXVII alkali metal salt XXVIII XXIX wherein in formulas XXVIII and XXIX, X and Z have the same meaning as above.

This pyrolysis of an alkali metal salt derived from a compound of formula XXVII can be effected under the same conditions as described above for the pyrolysis of a compound of formula XVIII to compounds of the formulas XIX and XX. Though either the IOB-compound of formula XXVIII or the lOa-compound of formula XXIX can be subjected to the subsequent steps of this reaction sequence, it is suitable to utilize the compound of formula XXVIII. Conversion of the lOu-compound of formula XXIX to the IOB-compound of formula XX- VIII can be effected under the same conditions as described above for the conversion of the compound of formula XX to a compound of formula XIX.

In the next step of this reaction sequence, the ll-hydroxy compound of formula XXVIII or of formula XXIX can be subjected to esterification whereby to convert the l l-hydroxy group to 21 leaving group in the 1 l-position. This esterification can be effected with the same acids or acid derivatives and in the same manner as described above for the esterification of a compound of formula XXIV to a compound of formula XXV. As in that instance, it is also preferred in the present instance to form a mesoxy leaving group in the l l-position, though, of course, other leaving groups as described above are useful for the instant purpose. There is thus obtained a compound of the formula Z H D 'ifir 1% X XXX wherein X, Z and LO have the same meanings as above. The leaving group can then be eliminated from the l l-position of a compound of formula XXX resulting in a direct formation of a desA-androst-9-en-5-one or a desA-pregn-Q-en-S-one of formulas XII, XV, XVI. This elimination can be effected by any conventional elimination means. It is suitably conducted under alkaline conditions in an anhydrous organic solvent. Preferably, it is effected by heating, .i.e. at a temperature between about room temperature and the reflux temperature of the reaction mixture. Thus, treatment of a compound of formula XXX with either an inorganic or organic base results in the formation of the desired compound of formulas XII, XV, XVI. Preferably a weak base is used, for example, a salt of a carboxylic acid (e.g. a lower alkanoic acid) with an alkali metal or an alkaline earth metal, for example, sodium acetate, potassium acetate, or the like. As indicated, the elimination is suitably conducted in an anhydrous organic solvent; suitable are solvents such as dilower alkyl-formamides, e.g. dimethyl formamide, lower alkanoic acids, e.g. acetic acid, or the like. When a proton accepting solvent, such as dimethyl formamide, is used, it itself can serve as the base for the of 5 this elimination reaction; i.e. if the solvent is basic then the elimination can be conducted without the addition of a separate basic material.

In another aspect, compounds of Formula XXX can be prepared from compounds of the formula i V In H3O [\Z /5 i X XXXA wherein X, Z and LO have the same meanings as above.

The compounds of formula XXXA can be prepared from corresponding ll-hydroxy compounds by esterification as described above for the preparation of compounds of formula XXV from compounds of formula XXIV. The compounds of formula XXX- can be prepared from compounds of formula XXXA in the same manner that compounds of formula XXX are prepared from compounds of formula XXV, i.e. by oxidative ring opening of the A-ring of a compound of formula XXXA followed by elimination of the residue of the A-ring to yield a compound of formula XXX. The oxidative ring opening of the compoundsof formula XXXA can be performed by ozonolysis as described above for conversion of a compound of formula XXV to a compound of formula XXVI. Such ozonolysis of a compound of formula XXXA yields a compound of the formula LONW XXXB

wherein X, Z and LO have the same meaning as above. A compound of formula XXXB can then be converted to a compound of formula XXX. This removal of the residue of the A-ring, i.e. decarboxylation, can be effected as described above'for the conversion of a compound of formula XIXB to a compound of formula XIX.

The compounds of formulas l-V preparable by the methods of this invention are not only pharmaceutically useful compounds as described above, but also are themselves useful as intermediates for other 93, IOa-steroids; for example compounds wherein X is hydrogen or lower alkyl can be modified so as to introduce unsaturation between C-6 and C-7. This can be effected by dehydrogenation means, for example, by halogenation followed by dehydrohalogenation or by means of 2,3-dichloro-5,-dicyanobenzoquinone, according to known methods. Thus, for example, a 9B, [Oat-progesterone of formula IV wherein X is hydrogen or lower alkyl can be con verted to a 9B, 10a-pregna-4,6-dien-3,20-dione.

A further embodiment of this invention comprises the preparation of 9B, IOa-steroids of formulas I-V containingan lI-hydroxy substituent. This can be effected by utilizing an 1 1 -hydroxy- I Oa-desA-androstan-S-one or 1 l-hydroxyl 00:- desA-pregnan-S-one of formula XXIX or an 1 l-hydroxy-IOB- desA-androstan-S-one or ll-hydroxy-lOB-desA-pregnan-S- one of formula XXVIII as the starting materials. It is preferred in this embodiment to use the lOB-isomers of formula XXVIII as starting materials. As a first step in this the ll-hydroxy group of the compound of formulas XXVlll or XXIX should be protected. This is suitably effected by esterificatlon, preferably with a carboxylic acid, for example, a lower alkanoic acid such as acetic acid. benzoic acid, or the like. Conversion of the so-obtained ll-esterified hydroxy compound then yields an ll-(esterified hydroxy)-desA-undrost-9-en-5-one (i.e. a compound of fomtula XII containing an ll-cstenfied hydroxy moiety) or an ll-esterified hydro'xy-desA-pregn-9- en-S-one (i.e. a compound of formulasXV-XVI containing an lla-esterified hydroxy moiety). This conversion can be effected by halogenation followed bydehydroha logenation, as described above for the conversion of a compound of formulas XIX or XX to a compound of formulas XII, XV or XVI. Catalytic hydrogenation of the so-obtained compound of the formula wherein X','Z and E0 have the same meaningas above.

This hydrogenation can be conducted in the same manner as described above for the hydrogenation of a compound of formulas XII-XVI to a compound of formulas VII, X, XI. Also, compounds of formula XXXII containing a l7-oxo moiety can be converted to a corresponding compound containing a 17,6- Iiy'droxy, Flat-lower alkenyl or lower alkynyl moiety by the methods described above. Also, compounds of formula XXXlI'can be hydrolyzed to yield corresponding 1 I-hydroxy compounds'of formula XXXII, i.e. wherein E0 is hydroxy.

Condensation of the so-obtained compound of formula XXXII or the corresponding 17fl-hydroxy, l7a-Iower alkenyl or lower alkynyl compound (i.e. a compound of formula VI containing a free or ll-esteritied hydroxy group) then yields the desired end-product 9B, loot-steroid of formulas I-V containing an ll-hydroxy group. Such condensation can be effected as described above for the preparation of a compound of formulas I-V from a compound of formulas VI-XI. The soobtained 93, IOa-steroids containing an I l-esterified hydroxy group can be hydrolyzed to the corresponding compounds containing an Il-hydroxy group, which latter compounds are themselves useful as intermediates, for example, the l 1-- hydroxy group can be oxidized by methods known per se to yield corresponding 1 l-oxo steroids analogous to compounds of fonnulas I-V.

The pharmaceutically useful compounds prepared by the methods of this invention can be administered internally, for example orally or parenterally, with dosage adjusted to individual requirements. They can be administered in conventional pharmaceutical forms, e.g. capsules, tablets, suspensions, solutions, or the like.

The following examples are illustrative but not limitative of this invention. All temperatures are in degrees Centigrade. The Florisil adsorbent used infra is a syntheuc magnesia-silica gel available from the Floridin Company, P. O. Box 989, Tallahassee, Fla. (cf. p. 1590, Merck Index 7th Edition, 1960). 100-200 mesh material was used. The moiety designated by tetrahydropyranyloxy is tetrahydro-Z-pyranyloxy. When it is stated that a procedure is effected in the cold, it should be understood that it is commenced at C. Throughout this application when compounds of the pregnane series are referred to it should be understood that it is compounds of the 173- pregnane series that are being referred to, unless specifically indicated to the contrary, and whether or not the compound of the pregnane series is specifically indicated as of the 173- series.

EXAMPLE 1 A solution of 3.2 g. of l7a-ethyltestosterone in 50 ml. methylene chloride and 25 ml. ethyl acetate was ozonized at 70 (acetone-dry ice bath) until the solution was blue in color. After oxygen was passed through, the solution was evaporated at room temperature in vacuo. The syrupy residue was then dissolved in 100 ml. of glacial acetic acid, and after addition of 5 ml. of 30 percent hydrogen peroxide, left for 24 hours at 05 Following'this time, it was evaporated to dryness, dissolved in 1,500 ml. ether, and extracted with 2N sodium carbonate solution. The alkaline extract was poured in ice cold hydrochloric acid. The resultant crystalline l7a-ethyl-l7 B-hydroxy-5-oxo-3,S-seco-A-norandrostan-3-oic acid was filtered, washed with water and dried. Upon being recrystallized from acetone, it melted at l96-l97 EXAMPLE 2 A solution of 1.5 g. of l'l'a-ethyl-l7B-hydroxy-5-oxo-3,5- seco-A-norandrostan-3-oic acid in 100 ml. of methanol was titrated with 2N sodium methoxide to the reddish color of phenolphthaleine, and then evaporated to dryness in vacuo,

giving as the residue, the sodium salt of l7a-ethyl-l7B- hydroxy-5-oxo-3,S-seco-A-norandrostan-3-oic acid. 5 g. of sodium-phenylacetate was added to the residue, and the mixture pyrolyzed in vacuo 0.l mm) at 285-295 for 2.5 hours. The sublimate was dissolved in acetone, filtered and the filtrate concentrated in vacuo. The resultant syrupy residue was chromatographed on a 60 g. Florisil (adsorbent) column. The fractions eluted with benzene and 0.5 per cent ethylacetate in benzene were combined and gave l7a-ethyll7B-hydroxy-lOu-desA-androstan-S-one, m.p. 94-95 after recrystallization from petroleum ether. The fractions eluted with 2 percent and 5 percent ethylacetate in benzene were combined and gave l7a-ethyl-17B-hydroxy-lOB-desA-androstan-S-one, m.p. l85-185.5, after two recrystallizations from petroleum ether.

EXAMPLE 2a:

EXAMPLE 3 1.13 g. of l7a-ethyl-l7,8-hydroxy-lOa-desA-androstan-S- one was dissolved in 120 ml. of anhydrous ether (or 1.13 g. of lOfl-isomer was dissolved in 300 ml. of anhydrous ether), and after cooling in a salt-ice bath, several drops of 30 percent hydrobromic acid in acetic acid were added. This was followed by the dropwise addition during 5 minutes of 0.684 g. of bromine dissolved in 2 ml. of acetic acid. This addition was synchronized with the decoloration rate of the reaction mixture. Immediately after this, 5 ml. of a saturated solution of sodium bisulfite and 5 ml. of 2N sodium carbonate solution were added. The mixture was then transferred into a separatory funnel, 500 ml. of ether added, shaken and separated. The ether part was washed with water, dried and evaporated. The resultant bromides were dissolved in 100 ml. of dimethylformamide, and after addition of 3 g. of lithium carbonate, the solution was heated at 100 for 45 minutes. After cooling, it was poured into 1 liter of ether, washed with water, 1N hydrochloric acid, 2N sodium carbonate, water, dried and evaporated. The residue was dissolved in 40 ml. of glacial acetic acid, 1.2 g. of sodium acetate and 1.2 g. of zinc powder added, and the so-formed mixture heated 10 minutes at It was then poured into 1 liter of ethylacetate and the resultant solution washed with saturated sodium bicarbonate, then with water, dried and evaporated. The residue was chromatographed on Florisil (adsorbent) column. The fraction with benzene and one-half percent ethylacetate in benzene gave regenerated starting material. Fractions with l and 2 percent ethylacetate in benzene gave l7a-ethyl-l7B hydroxy-desA- androst-9-en-5-one, which after sublimation (140 and 0.1 mm. Hg vacuum), was obtained as a glass. [a],. 36.6 (c=l CHCl EXAMPLE 4 A suspension of 262 mg. of 5 per cent rhodium on alumina catalyst in a mixture of 26 ml. of percent ethanol and 5.25 ml. of 2N sodium hydroxide solution was pre-reduced, (i.e. hydrogenated at room temperature and atmospheric pressure). To this was added a solution of 262 mg. of l7a-ethyl-l7 [3-hydroxy-desA-androst-9-en-5-one in 15 ml. of 95 percent ethanol, and the mixture then hydrogenated at atmospheric pressure and room temperaturesAfter l mole-equivalent of hydrogen was absorbed, the reaction was stopped, the catalyst was separated by filtration, and the filtrate evaporated in vacuo. Glacial acetic acid (l ml.) was added to the residue, which was then dissolved in 1 liter of ether. The cloudy solution which resulted was washed with 2N Na CQ, solution, then with water, dried and evaporated to dryness in vacuo.

The reaction was repeated three more times, and the combined products chromatographed on a Florisil (adsorbent) column. The eluates with 1 percent ethyl acetate in benzene gave first crystalline fractions, which were followed by noncrystalline fractions. The non-crystalline fractionswere dissolved in ml. of methylene chloride, and after the addition of 2.5 ml. of 2% CrO in 90 percent acetic acid, stirred overnight. The excess of chromic acid was removed by washing the methylene chloride solution with 10 ml. of 10 percent sodium hydrogen sulfite solution, followed by washing with 2N Na CO solution and then with water. It was then dried and evaporated in vacuo. The residue was dissolved in 50 ml. of anhydrous ethanol containing 172 mg. of sodium ethoxide, and left overnight. The next day, after addition of 0.5 ml. glacial acetic acid, the solution was evaporated in vacuo, and the residue was taken up in 1 liter of ether. The ether solution was washed with 2N Na CQ, solution, then with water, dried and evaporated. The residue was chromatographed on Florisil (adsorbent) column and gave crystalline l7a-ethyl-l7/3-hydroxydesA-9B, IOB-androstan-S-one identical (by thin layer chromatography) with the crystalline material obtained in the first chromatographic separation. After two recrystallizations from ether, it melted at l42-l44; [a],, l1.65 [methanol, c=1.245 percent].

EXANIPLE 5 To a solution of 132 mg. of l7a-ethyl-l7fi-hydroxy-desA- 9B, lOB-androstan-S-one in l2.5 ml. of absolute ethanol containing 34 mg. of sodium ethoxide, 0.15 ml. of freshly distilled methylvinyl ketone was added. The reaction mixture was then refluxed for 2 hours in a nitrogen atmosphere. After cooling the reaction mixture, 0.1 ml. of glacial acetic acid was added thereto and the resulting mixture was then poured into 1 liter of ether. The resultant ether solution was washed with water, dried over anhydrous sodium sulfate and evaporated in vacuo. The residue was chromatographed on fluorescent silica-gel plates, with the solvent system, 60 percent ethyl acetate-40 percent heptane. The fluorescent part of the layers was extracted with ethyl acetate. The residue obtained after evaporation of ethyl acetate was first crystallized from ether-petroleum ether, then a second time from pure ether, yielding 17c:- ethyl-9B, loot-testosterone, m.p.. l31-l35.

EXAMPLE 6 A solution of 6.4 g. of lla-hydroxy-progesterone in 100 ml. of ethylacetate and 50 ml. of methylene chloride was treated with ozone at -70 until the solution became blue in color. Oxygen was then passed through and the solution evaporated at room temperature in vacuo. The so-obtained syrupy residue was dissolved in 100 ml. of glacial acetic acid, and after the addition of ml. of .30 percent hydrogen peroxide, left for 24 hours at 2 (in an ice box). The solution was then evaporated in vacuo, and the residue triturated with ether yielding crystals. Recrystallization from acetone yielded lla-hydroxy- 3,S-seco-A-nor-pregnane-S,20-dione-3-oic acid 3,1l-lactone, m.p. 253256. [a],,'*'-"-ll93.3 (c=1, in chloroform).

EXAMPLE 7 A methanolic solution of 7.5 g. of l la-hydroxy-3,5-seco-A- nor-pregnane-S,20-dione-3-oic acid 3,1 l-lactone was treated with one equivalent of lON sodium hydroxide solution and then evaporated to dryness Sodium phenyl-acetate (26 g.) was added to the so-obtained sodium salt and the mixture pyrolyzed at 295 for two hours in vacuo. The crude sublimate was chromatographed on a silica-gel column and eluted with l 0 percent ethylacetate in benzene. The amorphous solid 1 1ahydroxy-lOa-desA-pregnane-5,20-dione was first eluted from the column. lR-spectrum in chloroform: 3620 and 3600 cm (-OH); 1706 cm (carbonyl group). NMR-spectrum in deuterochloroform: a doublet for IOa-Cl-l at 73.5 and 80.5 c.p.s. downfield from TMS at 60 Mc/sec. Further elution of the column with percent ethylacetate in benzene yielded crystalline 1 l a-hydroxyl OB-desA-pregnane-S ,ZO-dione which was recrystallized from methylene chloridepetroleum ether, m.p. 150-l52; [a] "+84.0 (c''"0.5 in absolute ethanol).

EXAMPLE 8 To a solution of 100 mg. of methanesulfonylchloride in 0.7 ml. of pyridine, there was added 100 mg. of 1 la-hydroxy-IOB- desA-pregnane-S,20-dione. The mixture was then allowed to stand overnight at 2 (in a refrigerator), then was diluted with water (100 ml.) and extracted with chloroform (3 X 150 m1.) and methylene chloride (100 ml.). The combined organic extracts were washed with water, lN hydrochloric acid and. again with water, then dried over anhydrous sodium sulfate and evaporated in vacuo. The crystalline residue was recrystallized from ether, giving 1 la-hydroxy-lofi-desA- pregnane-5,20-dione methanesulfonate, m.p. l39l40'-; [oz] l-46 (c==0.5 in absolute ethanol).

EXAMPLE 9 A solution of 200 mg. of l la-hydroxy-lOB-desA-pregnane- 5,20-dione methanesulfonate in 50 ml. of dimethylformamide wa refluxed for 8 hours and then evaporated to dryness. The residue was chromatographed on a Florisil (adsorbent) column. Elution with 2 percent ethylacetate/benzene and evaporation of the eluant yielded desA-pregn-9-ene-5,20- dione in the form. of colorless needles, m.p. l ll-113. It was shown by mixed melting point to be identical with a sample of the same compoundprepared as described in Example 12.

EXAMPLE 10 To a solution of 20 g. of l lwhydroxy-progesterone in 150 ml. of pyridine maintained at 0, there was added 6 ml. of methane-sulfonylchlon'de, and the reaction mixture allowed to stand overnight at 0. It was then diluted with a large excess of water and extracted'with chloroform. The organic extracts were washed with 2N hydrochloric acid and water, then dried over anhydrous sodium sulfate and evaporated in vacuo. The solid residue was recrystallized from methanol to give 1 lamesyloxy-progesterone, m.p. 159.5-160; [111 -64 45.6 (c=l, chloroform). I

EXAMPLE 1 l A solution of 12 g. of l la-mesyloxy-progesterone in 300 ml. of methylene chloride/ethyl acetate (2:1) was treated with ozone at until the solution became blue in color. The excess of ozone was removed by bubbling oxygen through the reaction mixture for 5 minutes. Methylene chloride was then removed under reduced pressure, and the solution diluted with ethyl acetate to 200 ml. After addition of 12 ml. of 30 percent aqueous hydrogen peroxide, the reaction mixture was then allowed to stand overnight at 2 (i.e., in the refrigerator), then evaporated to a volume of ml. and diluted with ml. of benzene. The aqueous solution, obtained by extraction with 8 portions of 75 ml. 2N sodium carbonate followed by combining the aqueous extracts was acidified with cold concentra ted hydrochloric acid to pH 2 and extracted with methylene chloride. This extract was dried over anhydrous sodium sulfate and evaporated in vacuo to dryness. The residue crystallized when triturated with ether-acetone mixture, yielding crude lla-mesoxy-5,20-dioxo-3,S-seco-A-norpregnan-3-oic acid. After recrystallization from acetonepetroleum ether, 152-153; [a],,+ 47.9 (c l, chloroform).

7 EXAMPLE 12 A solution of 6 g. of l la-mesoxy-5,20-dioxo-3,5-seco-A- nor-pregnan-3-oic acid in ml. of methanol was mixed with a solution of 1.5 g. of sodium carbonate in 55 ml. of water. The mixture was then transferred into a 1 liter sublimation flask, and evaporated to dryness. To the thus formed sodium salt, 20 g. of sodium phenyl acetate is added, and after closing the top part of the apparatus, this mixture was pyrolyzed at 290 and 0.02 mm. for 4 hours. The product, which collects on the cold finger, was dissolved in ether and filtered. The filtrate was then evaporated to dryness. Purification of the residue by chromatography on a 40 g. silica-gel column (benzene eluant) gave crystalline desA=pregn-9-ene-5,20-dione; m.p. l l l-1 1 3 (after recrystallization from ether). [a] 568 (0 0.25 per cent in methanol).

EXAMPLE 13 To a solution of 1.2 g. of desA-preg'n-Q-ene-5,20-dione in 20 ml. of methanol maintained at 0, there was slowly added a cooled solution of 1.2 g. of sodium borohydride in 22 ml. methanol, and the resultant mixture was left for 72 hours at 0. It was then dilutedwith 100 ml. of water and extracted with four 100 ml. portions of chloroform. The extract was dried over anhydrous sodium sulfate and evaporated in vacuo, yielding a colorless oily product. This product was dissolved in 250 ml. of chloroform and 6 g. of manganese dioxide was added to the solution which was then stirred for 72 hours at room temperature, filtered and the filtrate evaporated to dryness in vacuo. The residue was chromatographed on a silica-gel column and the eluates with 5 percent ethyl acetate in benzene, after concentration gave crystalline 20a-hydroxydesA-pregn-9-en-5-one which upon recrystallization from methylene chloride-petroleum ether formed colorless needles, m.p. l22l23; [01],, 33 (c= 0.5, absolute ethanol).

EXAMPLE l4 A suspension of 262 mg. of percent rhodium on alumina catalyst in a mixture of 26 ml. of 95 percent ethanol and 5.25 ml. of 2N aqueous sodium hydroxide was hydrogenated at room temperature and atmospheric pressure. To this was added a solution of 262 mg. of 20a-hydroxy-desA-pregn-9-en- 5-one in l5 ml. of 95 percent ethanol, and the reaction mixture then hydrogenated at room temperature and atmospheric pressure. After one mole equivalent of hydrogen was absorbed, the reaction was stopped, and the catalyst was separated by filtration. After standing overnight the filtrate was concentrated in vacuo. To the residue was added 1 ml. of glacial acetic acid, and it was then dissolved in 1 liter of ether. The cloudy solution was washed with 2N aqueous sodium carbonate solution, then with water, then dried over anhydrous sodium sulfate and evaporated to dryness in vacuo. lt yielded a colorless oil, which was chromatographed on a silica-gel column using 1 per cent ethyl acetate in benzene as the elutant. First eluted was 20a-hydroxy-10a-desA-pregnan-5-one, m.p. 107-108 after recrystallization from methylene chloride/petroleum ether. R.D. (in methanol); [11], 25.3, [a] -89; [011 274;'[a] l335; [a] -l 165.

Further elution yielded ZOa-hydroxy-QBJOB-desA- pregnan-S-one as a colorless oil. R. D. (in methanol): [01],, 14.8; [01] 4.4; [111 222; [011 2148.

EXAMPLE A suspension of 262 mg. of 5 per cent rhodium on alumina catalyst in a mixture of 2 ml. of 3N aqueous hydrochloric acid and 18 ml. 95 percent ethanol was hydrogenated at room temperature and atmospheric pressure. A solution of 262 mg. of a-hydroxy-desA-pregn-9-en-5-one in 5 ml. of absolute ethanol was introduced into the hydrogenation flask, and the reaction mixture was then hydrogenated at room temperature and atmospheric pressure. After one mole-equivalent of hydrogen was absorbed, the reaction was stopped, the catalyst was separated by filtration, and the filtrate neutralized with 2N aqueous sodium hydroxide solution. An excess of 5 ml. of 2N aqueous sodium hydroxide was added and the solution allowed to stand overnight. Ethanol was then removed by evaporation at reduced pressure, and after addition of 1 ml. of glacial acetic acid, it was extracted with 1 liter of ether. The extract was washed with 2N aqueous sodium carbonate solution, then with water, dried and concentrated in vacuo. It gave a colorless oil, which was chromatographed on a silica-gel column using 2 percent ethyl acetate in benzene as the elutant. The first fractions of the eluate yielded, upon concentration, 2OB-hydroxy-lOa-desA-pregnan-S-one. From the immediately subsequent fraction, 20B-hydroxy-9B,l0,8-desA- pregnan-5-one was obtained. Both products were identical with the same compounds obtained in Example 14.

EXAMPLE l6 2OB-Hydroxy-9B, l Oa-pregn-4-en-3-one is prepared by con: densation of 2OB-hydroxy-9B,IOB-desA-pregnan-S-one with methyl vinyl ketone according to the procedure of Example 5. The product melts at 176.5l 785; [a] l43 (chloroform).

EXAMPLE 17 A medium is prepared of 20 g. of Edamine enzymatic digest of lactalbumin, 3 g. of corn steep liquor and 50 g. of technical dextrose diluted to 1 liter with tap water and adjusted to a pH of 4.3 4.5. Twelve liters of this sterilized medium is inoculated with Rhizopus nigricans minus strain (A.T.C.C. 6227b) and incubated for 24 hours at 28 using a rate of aeration and stirring such that the oxygen uptake is 6.3 7 millimoles per hour per liter of Na SO according to the method of Copper et al., Ind. Eng. Chem., 36, 504 1944). To this medium containing a 24 hour growth of Rhizopus nigricans minus strain, 6 g. of l7a-acetoxy-progesterone in 150 ml. of acetone is added.

The resultant suspension of the steroid in the culture is incubated under the same conditions of temperature and aeration for an additional 24 hour period after which the beer and mycelium are extracted. The mycelium is then filtered, washed twice, each time with a volume of acetone approximately equal in volume to the mycelium, extracted twice, each time with a volume of methylene chloride approximately equal to the volume of the mycelium. The acetone and methylene chloride extracts including solvent are then added to the beer filtrate. The mixed extracts and beer filtrate are then extracted successively with 2 portions of methylene chloride, each portion being one-half the volume of the mixed extracts and beer filtrate, and then with 2 portions of methylene chloride, each portion being one-fourth the volume of the mixed extracts and beer filtrate. The combined methylene chloride extracts are then washed with 2 portions of a 2 percent aqueous solution of sodium bicarbonate, each portion being one-tenth the volume of the combined methylene chloride extracts. The methylene chloride extracts are then dried with about 3 5 g. of anhydrous sodium sulfate per liter of solvent, and then filtered. The solvent is then removed from the filtrate by distillation, and the residue is dissolved in a minimum of methylene chloride, filtered and the solvent evaporated from the filtrate. The resulting crystals are then dried and washed five times, each time with a 5 ml. portion of ether per gram of crystal. The crystals are then recrystallized from ether giving l7a-acetoxy-l la-hydroxyprogesterone. l7a-acetoxyl la-mesoxy-progesterone is prepared by treatment of l7a-acetoxy-l la-hydroxyprogesterone with methanesulfonyl chloride, according to the procedure of Example 10.

EXAMPLE 1 8 SeVenteena-AcetoXy-S,2O-dioxo-l la-mesoxy-A-nor-S ,5- seco-pregnan-B-oic acid is prepared by ozonolysis of 17aacetoxy-lla-mesoxy-progesterone, according to the procedure of Example 1 l.

EXAMPLE l9 Seventeena-Acetoxy-desA-pregn-9-ene-5,20-dione is prepared from 1 7a-acetoxy-5 ,20-dioxol la-mesoxy-A-nor- 3,5-seco-pregnan-3-oic acid by conversion of the latter toits sodium salt followed by pyrolysis, according to the procedure of Example l2.

EXAMPLE 20 Seventeena-Acetoxy-20a-hydroxy-desA-pregn-9-enr5-one is prepared from l7a-acetoxy-desA-pregn-9-en-S,20-dione by reduction and reoxidation according to the procedure of Example l3.

EXAMPLE 21 Seventeena-Acetoxy-20a-hydroxy-9B, l OB-desA-pregnan- 5-one is prepared from l7a-acetoxy-20B-hydroxy-desA- pregn-9-en-5-one by hydrogenation under acidic conditions in the presence of a rhodium catalyst, according to the procedure of Example 15.

EXAMPLE 22 EXAMPLE 23 TwentyB-Hydroxy-4methyl-9B, lOa-pregn-4-en-3-one is prepared by condensing 20B-hydroxy-9B,IOa-desA-pregnan- 5-one and ethyl vinyl ketone according to the procedure of Example 5.

SeventeenB-Hydroxy-S-oxo-B,5-seco-A-nor-androstan-3- oic acid is prepared by ozonolysis of testosterone according to the procedure of Example 1.

EXAMPLE 25 EXAMPLE 26 SeventeenB-Hydroxy-desA-androst9-en-S-one. is prepared from l7,6-hydroxy-lOa-desA-androstan-Soneby bromination followed by dehydrobromination, according to the procedure of Example 3.

EXAMPLE 26a DesA-androst-9-ene-5,l7-dione is prepared from 173- hydroxy-desA-androst-9-en-5-one by oxidation of the latter with a 2 percent chromic acid solution in 90 percent acetic acid. The so-obtained desA-androst-9-ene-5, l 7-dione is recrystallized from cyclohexane and melts at l23-l 235; [a] =+83 (c= 0. 1021, dioxane).

EXAMPLE 27 A solution of 236 mg. of l7B-hydroxy-desA-androst-9-en-5- one in 40 ml. 95 percent ethanol and 5.25 m]. 2N aqueous sodium hydroxide solution was hydrogenated with one mole equivalent of hydrogen over 236 mg. of prereduced 5 percent rhodium on alumina catalyst. After separation of catalyst, the solution was concentrated in vacuo to dryness, and the residue taken up in one liter of ether. The ether solution was washed with water, dried over anhydrous sodium sulfate and evaporated to dryness in vacuo. From the residue l'lfi-hydroxy-9B,lOB-desA-androstan-S-one was obtained by crystallization. M. p. l44.5-l45; [a],,'*' 22 (c=0.l03; dioxane). The l 7B-acetate (i.e. l 7B-acetoxy-9B, B-desA-androstan-5-one) is obtained by acetylation of testosterone followed by ozonolysis, I pyrolysis, bromination and dehydrobromination, and reduction according to the methods-of Examples 24, 25, 26 and 27 respectively, and melts at l l8l 19 [a],, 28 (c= 0.103; dioxane)l EXAMPLE 28 vA solution of 238 mg. of l7B-hydroxy-9fiJOfi-desA-androstan-S-one, 1 ml. of ethylene glycol and catalytic amount of p-toluene sulfonic acid in 100 ml. of anhydrous benzene was slowly distilled until no more water was coming over. The solution was then concentrated in vacuo to a small volume, and i7B-hydroxy-9BJOfi-desA-androstan-S-one 5ethylene ketal was obtained from the residue by crystallization. M. p. l l5-l 16; [01],,9 (c=0.0987; dioxane).

EXAMPLE 29 catalytic amount of p-toluene sulfonic acid given 93,10,8-

desA-androstane-5,l7-dione which melts, after recrystallization from cyclohexane, at 77.5-78; [01],, +55 (c 0.107; dioxane).

EXAMPLE 30 To a preformed solution of one mole equivalent of prop-l inyl lithium in [00 ml. of anhydrous liquid ammonia was added tetrahydrofuran solution of 200 mg. of 9,6,l0B-desA- androstane-5,l7-dione 5-mono-ethylene ketal, and the reaction mixture stirred for 2 hours. After addition of 1 gram of ammonium chloride, cooling was discontinued, and the reaction mixture allowed to evaporate. The residue was extracted with methylene chloride, the extract was washed with water, dried over anhydrous sodium sulfate and evaporated. The residue was dissolved in 20 ml. of acetone and the catalytic amount of p-toluenesulfonic acid added, and the solution was refluxed for 2 hours, then poured in water and extracted in methylene chloride. The methylene chloride extract was washed with water,then dried over anhydrous sodium sulfate and evaporated to dryness in vacuo. Crystallization of the residue gave l7a-( prop-l '-inyl)- l 7B-hydroXy-9B,lOl3-desA- andros-tan-S-one.

EXAMPLE 3l Seventeena-( prop-l '-inyl l 7,8-hydroxy-9B, l Oa-androstan- 4-en-3-one is prepared by condensing methyl vinyl ketone with 1 7a-( prop-l -inyl l 'iB-hydroxy-QB, l OB-desA-androstan-S-one according to the procedure of Example 5. The product melts at l64l 65.

EXAMPLE 32 To astirred solution of l mole equivalent of Z-methyl-prop- 2-enyl magnesium bromide in ml. of ether at room temperature was added dropwise a solution of 280 mg. of 93,103- desA-androstane-5,l7-dione 5-mono-ethyl'ene ketal in 100 ml. of tetrahydrofuran. The reaction mixture was refluxed for one hour. After cooling in an ice-salt bath, a saturated solution of sodium sulfate was slowly added to decompose the Grignard complex. This was followed by addition of anhydrous sodium sulfate. The solution was separated by filtration and concentrated in vacuo to dryness. The solution of the residue and of a catalytic amount of p-toluene sulfonic acid in 20 ml. of acetone was refluxed for 2 hours, then poured in water and extracted in methylene chloride. Methylene chloride extract was washed with water, dried over anhydrous sodium sulfate and evaporated to dryness From the residue 1 7a-( 2-methyl-prop-2'-enyl)-l 7B-hydroxy-9B, l OB-desA-androstan-S-one was obtained.

EXAMPLE 33 Seventeena-( 2' -methyl-prop-2'-enyl)- 1 7B-hydroxy-9B ,l0a-androst-4-en-3-one is prepared from l7a-(2-methylprop-2'-enyl l 7,6 -hydroxy-9B, lOB-desA-androstan-S-one by condensation of the latter with methyl vinyl ketone according to the procedure of Example 5. The product melts at l06-l() 8.

EXAMPLE 34 Sixteena-Acetoxy-20-ethylenedioxy-pregn-4-en-3-one is prepared by 20-ethylenedioxy-acetylation of l6a-hydroxy-20- ethylenedioxy-pregn-4-ene-3,20-dione with one equivalent of acetic anhydride in pyridine solution at room temperature for 2 hours, followed by concentration to dryness in vacuojSixteena-Acetoxy-20ethylenedioxy-5-oxo-3,5-seco-A-norpregnan-B-oic acid is prepared .by oxonolysis of la-acetoxy- 20-ethylenedioxy-pregn-4-en-3-one according to the procedure of Example 1.

EXAMPLE 35 Sixteena-Acetoxy-20-ethylenediox y- IOa-desA-pregnan- 5- one and l6a-acetoxy-20-ethylenedioxy-lOfl-desA-pregnan-S- one are prepared from l6a-acetoxy-20-ethylenedioxy-S-oxo- 3,5-seco-A-norpregnan-3-oic acid by conversion of the latter to its sodium salt followed by pyrolysis (according to the rocedure of Example 2) and reacetylation with acetic anhydride and pyridine.

EXAMPLE 36 Sixteena-Acetoxy-ZO-ethylenedioxy-desA-pregn-9-en-5- one is prepared from l6a-acetoxy-20 ethylenedioxy-10adesA-pregnan-S-one by bromination followed by dehydrobromination, according to the procedure of Example 3.

EXAMPLE 37 Sixteena-Acetoxy-20-ethylenedioxy-9B, l OB-desA-pregnan- -one is prepared from la-acetoxy--ethylenedioxy-desA- pregn-9-en-5-one by hydrogenation under basic conditions in the presence of a rhodium catalyst, according to the procedure of Example 14.

EXAMPLE 38 Sixteena-Hydroxy-20-ethylenedioxy-9B, I 0a-pregn-4-en-3- one is prepared by condensing l6a-acetoxy-20-ethylenedioxydesA-9/3,lO,B pregnan-5-one with methyl vinyl ketone according to the procedure of Example 5.

EXAMPLE 39 EXAMPLE 40 Sixteena-Methyl-ZO-ethylenedioxy-lOa-desA-pregnan-S- one and l 604-methyl-2O-ethylenedioxyl OB-desA-pregnan-S- EXAMPLE 45 Twenty-one-Acetoxy-l l a-mesoxy-20-ethylenedioxy-5-oxo- 3,5-seco-A-norpregnan-3-oic acid is prepared by ozonolysis of 2 l -acetoxy-l la-mesoxy-ZO-ethylenedioxy-pregn-4-en-3-one, according to the procedure of Example 1 l.

EXAMPLE 46 Twenty-one-Acetoxy-20-ethylenedioxy-desA-pregn-Q-en-5- one is prepared from 2 l-acetoxy-20-ethylenedioxy-l lamesoxy-3,S-seco-A-norpregnan-S-bic acid by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example l2, except that the crude product is reacetylated by treatment with acetic anhydride/pyridine prior to its being worked-up.

EXAMPLE 47 Twenty-one-Acetoxy-20-ethylenedioxy-9/3, l OB-desA- pregnan-S-one is prepared from 2l-acetoxy20-ethylenedioxy-des'A-pregn-9en-5-one by hydrogenation under acidic conditions in the presence of a rhodium catalyst, according to the procedure of Example 15.

EXAMPLE 48 Twenty-one-Hydroxy-20-ethylenedioxy-9fl, l 0a-pregn-4- en-3-one is prepared from 2l-acetoxy-20-ethylenedioxy-9 BJOB-desA-pregnan-S-one by condensing the latter with methyl vinyl ketone, according to the procedure of Example one are prepared from l6o:-methyl-ZO-ethylenedioxy-S-oxo- 3,5-seco-A-norpregnan-3-oic acid by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example 2.

EXAMPLE 41 Sixteena-Methyl 20-ethylenedioxy-desA-pregn-9-en-5-one is prepared from l6oz-methyl-ZO-ethylenedioxy-IOa-desA- pregnan-S-one by bromination followed by dehydrobromination, according to the procedure of Example 3.

EXAMPLE 42 Sixteena-Methyl-ZO-ethylenedioxy-9B, lOB-desA-pregnan- 5-one is prepared from l6a-methyl-20-ethylenedioxy-desA- pregn-9-en-5-one by hydrogenation under basic conditions in the presence of a rhodium catalyst, according to the procedure of Example 14.

EXAMPLE 43 Sixteena-Methyl-20-ethylenedioxy-9B, l Oa-pregn-4-en-3- one is prepared by condensing l6a-methyl-20-ethylenedioxy- 96,1OB-desA-pregnan-S-one with methyl vinyl ketone, according to the procedure of Example 5.

EXAMPLE 44 Twenty-one-Acetoxy-l la-hydroxy-ZO-ethylenedioxypregn-4-en-3-one is prepared by microbiological treatment of 2 l-acetoxy-20-ethylene-dioxy-pregn4-en-3-one, according to the procedure of Example 17. 2l-Acetoxy-l1a-mesoxy-20- ethylenedioxy-pregn-4-en-3-one is prepared by treatment of 2 l -acetoxy-l la-hydroxy-ZO-ethylenedioxy-pregn-4-ene-3- one with methanesulfonyl chloride, according to the procedure of Example 10.

EXAMPLE 49 Elevena-Mesoxy- 1 6a, 1 7a-isopropylidenedioxyprogesterone is prepared by treatment of lla-hydroxy-l6 a,l7a-isopropylidenedioxy-progesterone with methane sulfonyl chloride, according to the procedure of Example 10.

EXAMPLE 5O Five,twenty-dioxo- 1 la-mesoxy- 1 6a, 1 7a-isopropylidenedioxy-3,S-seco-A-norpregnan-S-oic acid is prepared by ozonolysis of l la-mesoxy- 1 6a, 1 7oz-isopropylidenedioxyprogesterone, according to the procedure of Example I 1.

EXAMPLE s1 Sixteena, l 7a-isopropylidenedioxy-desA-pregn-9-en-5 ,20- dione is prepared from 5,20-dioxo-l la-mesoxy-16a,l 7aisopropylidenedioxy-3,5-seco-A-norpregnan-3-oic acid by conversion of the latter to its sodium salt, followed by pyrolysis according to the procedure of Example 12.

EXAMPLE 52 TwentyB-Hydroxy- 1 6a, 1 7a-isopropylidenedioxy-desA- pregn-9-en-5-one is prepared from l6a,l7a-isopropylidenedioxy-desA-pregn-9-ene-5,ZO-dione by reduction and reoxidation, according to the procedure of Example 13.

EXAMPLE 5 3 TwentyB-Hydroxy- 16a, 1 7a-isopropylidenedioxy9fl, 1 0B- desA-pregnan-S-one is prepared from 20fl-hydroxy-l6a, l 7aisopropylidenedioxy-desA-pregn-9-en-5'0ne by hydrogenation according to the procedure of Example 14.

EXAMPLE 54 TwentyB-Hydroxy- 1 6a, 1 7a-isopropylidenedioxy-9B, 10apregn-4-en-3-one is prepared by condensing methyl vinyl.

ketone with 2OB-hydroxy-16a,l7ct-isopropylidenedioxy desA-9B,l0B-pregna.n-5-on.e according to the procedure of Example 5.

EXAMPLE 55 Sevena, l 7a-dimethyll 7B-hydroxy-5-oxo-3,5-seco-A- norandrostan-3-oic acidis prepared from 7a,l7a-di-methyltestosterone by ozonolysis of the latter, according to the procedure of Example 1.

EXAMPLE 6 EXAMPLE 57 Sevena, l 7a-dimethyll 7B-hydroxy-desA-androst-9-en-5- one is prepared from 7a,l7a-dimethyl-l7B-hydroxy-lOadesA-androstan-S-one by bromination followed by dehydrobromination, according to the procedure of Example 3.

EXAMPLE 58 Sevena, l 7a-dimethyll 7B-hydroxy-desA-9B, l OB-an drostan-S-one is prepared from7a,l 7a-dimethyll 7fi-hydroxy-desA-androst-9-en-5-one by hydrogenation in the presence of a rhodium catalyst, according to the procedure of Example 4.

EXAMPLE 59 Sevena, l 7a-dimethyl-9B, l Oat-testosterone is prepared from 7a, 1 7a-dimethyll 7fl-hydroxy-desA-9B, l Ofi-androstan-S-one by condensing the latter with methyl vinyl ketone, according to the procedure of Example 5.

EXAMPLE 60 Elevena-Mesoxy-l7a-methyl-progesterone is prepared from 1 la-hydroxy-l7a-methyl-progesterone by treatment of the latter with methane sulfonyl chloride, according to the procedure of Example 10.

EXAMPLE 61 Elevenu-mesoxy-l 7a-methyl-5 ,20-dioxo-3 ,5'-seco-A-norprcgnan-3-oic acid is prepared from l la-mesoxy-l7a-methylprogesterone by ozonolysis of the latter, according to the procedure of Example 1 1.

EXAMPLE 62 Seventeena-methyl-desA-pregn-9-ene-5,20-dione is prepared from 1 la-mesoxy-l 7a-methyl-5,20-dioxo-3,5-seco- A-norpregnan-El-oic acid by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example 12.

EXAMPLE 63 Twentyfl-Hydroxy- I 7a-methyl-desA-pregn-9-en-5 -one is prepared from l7a-methyl-desA-pregn-9-en-5,20-dione according to the procedure of Example 13.

EXAMPLE 64 Twentyfi-Hydroxyl 7a-methyl-9B, lOB-desA-pregnan-S- one is prepared from l7a-methyl-ZOB-hydroxy-desA-pregnan- 9-ene-5-one according to the procedure of Example 15.

EXAMPLE 65 V Twentyfl-Hydroxyl 7a-methyl-9B, l Oa-pregn-4-en-3-one is prepared by condensing 17a-methyl-2OB-hydroxy-9B,lOB- desA-pregnan-S-one with methyl vinyl ketone, according to the procedure of Example 4.

EXAMPLE 66 A solution of 12.8 g. of l7a-methyltestosterone in 200 ml. of methylene chloride and 100 ml. of ethyl acetate was hydroxy- 1 7a-methyl-5 -oxo-3,5

ozonized for 1 hour and 5 minutes at 70 (acetone-dry ice bath) until a blue color developed. After oxygen was bubbled through, the solution was then concentrated at room temperature in vacuo. The residue was dissolved in 400 ml. of acetic acid, and after addition of 30 ml. of 30 percent hydrogen peroxide, the solution was left overnight at 0. it was then evaporated to dryness in vacuo, the residue taken up in ether, and the ether solution extracted with 2N aqueous sodium carbonate 12 X 50 ml. The combined carbonate extracts were cooled in ice, and acidified with concentrated hydrochloric acid. The aqueous suspension of precipitated organic acid was extracted with methylene chloride, this extract was washed with water, dried over anhydrous sodium sulfate and evaporated giving as a colorless crystalline material 178- -seco-A-nor-androstan-3-oic acid. After recrystallization from acetone-hexane, it melted at l-l 97, [11],, 9.8 (c 1.0 in chloroform).

EXAMPLE 67 A solution of 10 g. of l7fl-hydroxy-l7a-methyl-5-oxo-3,5- seco-A-nor-androstan-3-oic acid in 250 ml. of methanol was made alkaline to phenolphthalein with sodium ethoxide, and evaporated to dryness. The residual powdery sodium salt was mixed well with 32 g. of sodium phenylacetate and 40 g. of neutral alumina (Woelm, Grade I), and the mixture heated at 290 in vacuo for 4 hours. After cooling to room temperature, a large excess of water was added, and the resultant suspension extracted with 2 liters of ether. The ether extract was washed with water, aqueous 2N sodium carbonate solution,

and again with water, dried and evaporated. This gave a sirupy residue, which by thin layer chromatograms and infrared spectra consisted of 17fl-hydroxy-l7a-methyHOa-desA-andrdstan-S-one as the major and l7B-hydroxyl 7a-methyl- 10B -desA-androstan-5-one as the minor product.

Three additional pyrolyses were performed as described above, and the combined products so-obtained was chromatographed on a 850 g. silica gel column, using 5 percent ethylacetate in benzene as the eluentsThis chromatography yielded 1 7fi-hydroxy- 1 7amethyl- IOa-desA-androstan-S-one, which after recrystallization from petroleum ether melted at 96-97, 0:1,, 28. 2(c= 0.5 in chloroform).

Further eluates of the column gave product, l7B-hydroxyl 7a-methyllOB-desA-androstan-S-one which, when recrystallized from ether, melted at l65l67, [04],, l 9.8(c 0.5 in chloroform).

To a solution of 2.2 g. of the mixture of l7/3-hydroxy-l 7amethyl- 1 Oa-desA-androstan- S-one and l 7fi-hydroxy-l 7amethyl lOB-dsA-androstan-Smne (obtained by the above pyrolysis procedure) in 50 ml. of absolute ethanol were added 20.1 ml. of a solution prepared by dissolving 2.48 g. of sodium metal in 250 ml. of absolute ethanol. The reaction mixture was stirred overnight at room temperature. it was then acidified with 2 of glacial acetic acid, and evaporated to dryness. The residue was extracted in ether (1 liter) and the ether extract washed with water, dried, and evaporated. The residue was crystallized from petroleum ether giving a quantitative yield of l 'lB-hydroxy-l 7a-methyll Oa-desA-androstan-S-one.

EXAMPLE 68 To a solution of 11.2 g. of 17B-hydroxy-l7a-metl'1yl-l0adesA-androstan-S-one in 1260 ml. of anhydrous ether, stirred and cooled in an ice-salt bath, were added first several drops of 30 percent hydrogen bromide in acetic acid, then dropwise a solution of 7. 16 g. of bromine in 20 ml. of glacial acetic acid. The rate of addition of the bromine solution was synchronized with the rate of disappearance of excess bromine. After bromination was complete, 53 ml. of 10 percent sodium hydrogen sulfite solution and 53 ml. of aqueous 2N sodium carbonate solution were added to the reaction mixture while stirring. The ether layer was then separated, washed with water, dried, and evaporated to dryness in vacuo. The residue was dissolved in 250 ml. of dimethylforrnamide, and heated with 7.5 g. of lithium carbonate at 100 for 45 minutes. After cooling, 2 liters of ether were added and the ether solution washed with water, 1N hydrochloric acid, and then again with water, dried and evaporated. The residue was dissolved in 200 ml. of glacial acetic acid, 12.6 g. of sodium acetate and 12.6 g. of zinc powder were added and the mixture heated for ten minutes at 80. After cooling to room temperature, the reaction mixture was filtered, and evaporated. The residue was dissolved in ethylacetate, and washed with saturated sodium bicarbonate solution, then with water, dried and evaporated. The so-obtained residue was chromatographed on a silica gel column using 10 percent ethylacetate in benzene as the eluent which gave first 17B-hydroxy-l7a-methyl-lOa-desA-androstan--one, followed by l7B-hydroxy-l7a-metllyl-desA- androst-9-en-5-one. After recrystallization from ether, the latter compound melted at l03l04, [11] 63.2 (d 0.5 in chloroform).

EXAMPLE 69 A suspension of 1.25 g. of 5 percent rhodium on alumina catalyst in a mixture of 130 ml. of 95 percent ethanol and 26 ml. of 2N sodium hydroxide was prereduced. To this was then added a solution of 1.25 g. of l7,8-hydroxy-l7a-methyl-desA- androst-9-en-5-one in 75 ml. of 95 percent ethanol, and then the mixture was hydrogenated at atmospheric pressure and room temperature. After 1 mole equivalent of hydrogen was absorbed, the reaction was stopped, the catalyst was removed by filtration, and the filtrate evaporated in vacuo. To the residue 5 ml. of glacial acetic acid was added, the so-formed mixture then dissolved in 2 liters of ether, and the resultant cloudy solution was washed with water, then dried and evaporated. The residue was dissolved in 50 ml. of methylene chloride and oxidized with 5 ml. of 2 percent chromic acid in 90 percent acetic acid until green color of reaction mixture. After then being washed with sodium hydrogen sulfite solution 2N sodium carbonate solution and water, the reaction mixture was dried over sodium sulfate and evaporated. The residue was chromatographed very slowly on a 50 g. silica gel column, with 5 percent ethylacetate in benzene, and followed with thin layer chromatography. First, l7B-hydroxy-l7a-methyl-9a,l0 or-desA-androstan-S-one was eluted. After a minor amount of mixed material, l7/3-hydroxy-l7a methyl-9B,lOfl-desA-androstan-S-one was eluted. After recrystallization from etherpetroleum ether, it melted at 94-96 EXAMPLE 70 I7oz-Methyl-9B,IOa-testosterone is prepared from 17amethyl- 1 7B-hydroxy-desA-9B, lOB-androstan-S-one by condensation of the latter with methyl ginyl ketone, according to the procedure of Example 5. The product melts at l28-l29.

EXAMPLE 71 A solution of 6 g. of l la,2OB-diacetoxy-pregn-4-en-3-one in 100 ml. methylene chloride and 50 ml. of ethylacetate was ozonized at 70. After methylene chloride was removed by distillation in vacuo, the residual solution was diluted to 100 ml. with ethylacetate. To this 5 ml. of 30 percent hydrogen peroxide was added and left overnight at room temperature. The reaction mixture was concentrated to dryness in vacuo, the residue taken up in 1 liter of ether, and the resulting solution extracted 10 times with 50 ml. portions of 2N aqueous sodium carbonate. The carbonate extract was then acidified with ice-cold concentrated hydrochloric acid. The precipitated product was separated by filtration, and crystallized to give 1 la,2OB-diacetoxy-5-oxo-3,5-secoA-norpregnan-3-oic acid.

EXAMPLE 72 A methanolic solution of 5 g. of l la,20B-diacetoxy-5-oxo- 3,5-seco-A-nor-pregnan-3-oic acid was treated with fa mole equivalent of sodium carbonate, and evaporated to dryness in vacuo. Potassium acetate (5 g.) was added to the residue which was then pyrolyzed at 295 and 0.02 mm. The sublimate was chromatographed on a silica-gel column to give 1 la,20fidiacetoxyl OB-desA-pregnan-S one.

EXAMPLE 73 Bromination and dehydrobromination starting with lla,20,8lOB-desA-pregnan-S-one according to the procedure of Example 3, gave lla,20/3-diacetoxy-desA- pregn-9-en-5-one.

EXAMPLE 74 Hydrogenation of Ila,ZOB-diacetoxy-desApregn-9-en-5- one in ethanolic hydrochloric acid over 5 percent rhodium on alumina catalyst at room temperature and atmospheric pressure according to the procedure of Example 15 gave 1 101,208- diacetoxy-QB, l OB-desA-pregnan-S-one.

EXAMPLE 75 Eleven a,20B-Diacetoxy-9B,lOB-desA-pregnan-S-one was hydrolyzed in methanol solution with one mole equivalent of potassium carbonate to give 1 1a,20B-dihydroxy-9B,l0l3- desA-pregnan-S-one.

EXAMPLE 76 Condensation of l la,20,8-dihydroxy-9,B, l OB-desA- pregnan-S-one with methyl vinyl ketone according to the procedure of Example 5 gave 1la,20,8-dihydroxy-9,B,l0apregn-4-en-3-one.

EXAMPLE 77 A solution of 3 g. of 17a-ethyl-l7fl-hydroxy-androsta-1,4- dien-3-one in 75 ml. of methylene chloride and 25 ml. of ethyl acetate was ozonized at 70" till it became blue. After evaporation to dryness, the residue was dissolved in ml. of glacial acetic acid containing 5 ml. of 30 percent hydrogen peroxide, and set at room temperature for 2 days. The reaction mixture was concentrated to dryness and the residue dissolved in 1 liter of ether. The ether solution was then extracted 10 times with 25 ml. portions of aqueous 2N sodium carbonate solution, and the carbonate extracts were acidified with ice-cold concentrated hydrochloric acid. The noncrystalline precipitate containing l7a-ethyl-l7B-hydroxy-l0a carboxy-desA-androstan-Sone was separated by filtration and dried, then dissolved in ml. of absolute ethanol, and after addition of 9 ml. of aqueous 2N sodium hydroxide, boiled for 1 hr. The reaction mixture was concentrated in vacuo to a small volume, and diluted with 1,750 ml. of ether. The ether solution was washed with water, dried over anhydrous sodium sulfate, and concentrated in vacuo to dryness. The residue was crystallized from ether-petroleum ether, to give 17a-ethyl-l7,8-hydroxy-lOa-deSA-androstan-S-Qne, m.p. 8990.

EXAMPLE 78 Three-( 17,8-hydroxy-5-oxo-3 ,5-seco-A-nor-androstan- 1 7ayl-3-oic acid)-propionic acid lactone is prepared by ozonolysis of 3-( 3-oxol 7B-hydroxy-androst-4-enl 7a-yl)-propionic acid lactone, according to the procedure of Example 1.

EXAMPLE 79 Three-( 1 7,8-hydroxy-5-oxo-IOcr-desA-androstan-1 7a-yl propionic acid lactone and 3-( l7fi-hydroxy-5-oxo-lOfl-desA- androstan-l7a-yl)-propionic acid lactone are prepared from 3-( l 7B-hydroxy-5-oxo-3 ,S-seco-A-nor-androstanl 7a-yl-3- oic acid)-propionic acid lactone by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example 2.

EXAMPLE 80 1 Three-( 1 7B-hydroxy-5-oxo-desA-androst-9-enl 7a-yl propionic acid lactone is prepared from 3-(17B-hydroxy-5- oxola-desA-androstan-l7a-yl)- ropionic acid lactone by bromination followed by dehydrobromination, according to the procedure of Example 3.

EXAMPLE 8] 3-( l7/3 hydroxy-5 -oxo-9B, IOB-desA-androstan- 1 7a-yl)- propionic acid lactone is prepared from 3-( 17B-hydroxy-5- oxo-desA-androst-9-en-l 7a-yl)-propionic acid lactone by hydrogenation in the presence of a rhodium catalyst, according to the procedure of Example 4.

EXAMPLE 82 Three-( l7B-hydroxy-3-oxo-9B, lOa-androst-4en- 1 7a-yl propionic acid lactone is prepared by condensing 3-(l7fi- 'hydroxy-5-oxo-9B, l OB-desA-androstanl 7a-yl )-propionic acid filactone with methyl vinyl ketone, according to the procedure of Example 5.

EXAMPLE s3 Seventeen a, 20;20,2l-bis-methylenedioxy-lla-mesyloxypregn-4-en-3-one is prepared by treatment of 17a,20;20,2lbis-methylenedioxyl la-hydroxy-pregn-4-en-3-one with methanesulfonyl chloride according to the procedure of Example [0.

EXAMPLE s4 Seventeen a,20;20,2 l-bis-methylenedioxy-l la-mesyloxy-S- oxo-3,5-seco-A-norpregnan-3roic acid is prepared by ozonolysis of l 7a,20;20,2 lbis-methylenedioxy-l la-mesyloxypregn-4-en-3-one according to the procedure of Example l 1.

EXAMPLE 85 Seventeen a,20;20,2 l -bis-methylenedioxy-desA-pregn-9- en-S-one is prepared from l7a,20;20,2l-bis-methylenedioxyl1a-mesyloxy-5-oxo-3,5-seco-A-norpregnan-3-oic acid by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example l2.

EXAMPLE 86 Seventeen a,20;20,2 l-bis-methylenedioxy-Qfi, l 0B-desA- pregnan-S-one is prepared from l'la,20;20,2l-bismethylenedioxy-desA-pregn-9-en-5-one by hydrogenation in the presence of a rhodium catalyst according to the procedure of Example 14. i

EXAMPLE 87 Seventeen a,20;20,2 l-bis-methylenedioxy-9fi, l0a-pregn-4 en-3-one is prepared by condensing methylvinyl ketone with l 7a,20;20,2 l-bis-methylenedioxy-9B,1OB-desA-pregnan-S- one, according to the procedure of Example 5 EXAMPLE 88 Twenty B-hydroxy-Qfl, l Oa-pregnal ,4-dien-3-one was prepared by condensation of 2OB-hydroxy-9BJOB-desA- pregnan-S-one with 1 equivalent of methyl ethinyl ketone in boiling benzene solution, catalyzed by sodium hydride.

EXAMPLE 89 One ml. of Jones Reagent (0.004 mole CrO is added to 200 mg. of l7,8-hydroxy-9B,IOB-desA-androstan-S-one in 20 ml. of acetone at l0. The mixture is then left for minutes at room temperature, and 5 ml. of ethanol then added. The resulting suspension is evaporated to dryness in vacuo, water is added to the residue and the undissolved moiety taken up in ether. The ether phase is then washed with a solution of sodium bicarbonate and then with water, dried over sodium EXAMPLE A solution of 250 mg. of 17B-hydroxy-fl,l0B-desA-androstan-S-one dissolved in 2.5 ml. of pyridine and 2.5 ml. of acetic anhydride, is left at room temperature for 18 hours. The mixture is then evaporated to dryness at 82lll mm.. the residue taken up in ether, and the ether phase washed with 1N hydrochloric acid, sodium bicarbonate and water, and then dried over sodium sulfate. After filtrationand evaporation of the ether, the residue is then treated with a small quantity of petroleum ether yielding crystals of l7B-acetoxy- 9 B, 108- desA-androstan-S-one which, upon recrystallization from methanol, melt at 1 18-1 l9"; [111 /589 28 (c 0. l03 percent, dioxane); R.D. in dioxane (c 0.103 percent): A in mpflal-value in 400 (30); 356 (0); 350 (+10) 313 (+449) max.; 307'(+374) min.; 305 (+380) mash; 300 (+224) ;293 (O); 280 (652).

EXAMPLE 91 A solution of 250 mg. of 17,8-acetoxy-93,lOfi-desA-androstan-S-one in 60 ml. of percent methanol containing 144 mg. of potassium hydroxide is refluxed for 60 minutes. The resulting mixture is evaporated to dryness in vacuo, water added to the residue and the suspension extracted with ether. The ether phase is washed with water, dried over sodium sulfate, filtered oh, the solvent removed and the crystalline residue then crystallized from a small volume of cyclohexane, yielding crystals of l7B-hydroxy-9BJOB-desA-androstan-S- one which upon being recrystallized from ethylacetate melt at 144.5-l45; [011 22 (c 0.l03, dioxane), R.D. in dioxane (c 0.103 A in my. ({al-value in 400 (7); 390 (0); 350 (+52); 313 (+571) max; 307 492) min.; 305 (+504) max.; 300 (+324); 293 (0) 290 (202).

EXAMPLE 92 A solution of 10 g. of llB-formyloxy-androsta-l,4-diene- 3,l7-dione in ml. of acetic acid was ozonized at 0 until thin layer chromatography did not show any starting material. The reaction mixture was then poured into 100 ml. of water and the mixture was then heated to 100 for 30 minutes. The mixture was then concentrated in vacuo and treated with 50 ml. of saturated sodium bicarbonate solution. The undissolved material was extracted with 100 ml. of ether. The extract was chromatographed on silica gel using methylene chloride. The eluates were concentrated and gave, on addition of hexane, I 1 B-formyloxy- 1 0-desA-androstane-5, 17-dione, m .p. l17-l 17.5" (recrystallized from acetone-cyclohexane), [(1] ,,**=93 (dioxane).

EXAMPLE 93 By hydrolysis of I l fi-formyloxy-lOg-desA-androstane-fi ,17- dione in 2 percent methanolic potassium hydroxide there is obtained 1 l B-hydroxyl 0f-desA-androstan-5J 7-dione, which melts at 154; [011 +96 (dioxane).

EXAMPLE 94 Two hundred and fifty mg. of llfi-hydroxy-log-desA-androstane-5,l7-dione and 250 mg. of p-toluene sulfonic acid monohydrate in 20 ml. of benzene were refluxed in a nitrogen atmosphere for 6 hours. The reaction mixture was then washed with an aqueous solution of sodium bicarbonate and then with water, dried over sodium sulfate, filtered and evaporated to dryness. The residue was then chromatogmax.-

raphed over silicagel g.) in dichloromethane. Triturating the residue obtained from the first 250 ml. eluted, yielded crystals of desA-androst-9-ene-5,l7-dione, which upon recrystallization from cyclohexane melted at 123-123.5.

EXAMPLE 95 The-compound, l 1 B-formyloxy-S 17-dioxo-3,5-seco-A-norandrostan-3-oic acid is prepared from 1 l-B-formyloxy-androst- 4-ene-3,17-dione by ozonolysis according to the procedure of Example 1 l. The so-obtained product melts at 22022l; [a] +107 (dioxane).

EXAMPLE 96 3.7 g. of the sodium salt of 1IB-formyloxy-S,17-dioxo-3,5- seco-A-nor-androstan-3-oic acid and 12 g. of sodium phenylacetate are fused together in.vacuo (0.1 Torr). When the bath temperature reaches 220 the molten mass begins to decompose. The bath is then heated further (within 30 minutes) to a temperature of 290. Once this temperature has been reached the mixture is left for another minutes at the initial pressure of 0.1 Torr. The distilled material is then chromatographed over 30 g. of aluminum oxide (activity grade 3). Elution with a total of 200 ml. of petroleum ether-benzene (2: 1 followedby evaporation of the solvent and trituration of the residue in the presence of petroleum ether, yields desA- androst-9-ene-5,l7-dione which upon recrystallization from cyclohexane melts at l23l23.5; [a],, =+83 (c= 0.1021, dioxane).

.EXAMPLE 97 EXAMPLE 98 A solution of 15.15 g. of /3-acetoxy-5-oxo-3,5-seco-A- nor-pregnan-3-oic acid in 250 ml. of 75 percent methanol containing 10 g. of potassium hydroxide was refluxed for 2 hours. The methanol was then removed in vacuo and the residue was dissolved in 100 ml. of water. The solution was chilled to 0 and acidified to congo red by the addition of 20 percent hydrochloric acid. There was thus obtained 20B- hydroxy-5-oxo-3,5-seco-A-nor-pregnan-3-oic acid, m.p. l8l-l82, [a]D" 13 (dioxane).

A solution of 4.7 g. of ZOB-hydroxy-S-oxo-3,5-seco-A-norpregnan-3-oic acid in 100 m1. of methanol was neutralized with 1N sodium methylate solution against phenolphthaleine. The solution was then evaporated and the residue, consisting of 2OB-hydroxy-5-oxo-3,5-seco-A-nor-pregnan-3oic acid sodium salt, was refluxed with 100 m1. of quinoline for 8 hours. The cooled mixture was poured on a mixture of 150 g. of ice and 100 ml. concentrated hydrochloric acid and extracted with ether. The ether extract was worked up and the oily residue was chromatographed on silica gel. Elution with methylene chloride gave lOa-desA-pregnane-5,20-dione, m.p. l26-l27 (crystallized from isopropyl ether), [01],, 82 (dioxane). Elution with methylene chloride containing 1 percent acetone gave ZOB-hydroxy-l0a-desA-pregnan-5-one, m.p. l04-l04.5 (crystallized from ether-hexane), [aJ 10 (dioxane). The fractions obtained with methylene chloride containing 5-10 percent acetone were evaporated and the oily residue was dissolved in ml. of acetone. The solution was treated with 3 ml. of Jones reagent (0.004 mole CrO at l0 and kept at the same temperature for 10 minutes. After the addition of 5 ml. of methanol, the solution was evaporated and the residue was diluted with water and extracted with ether. The ether extract was worked up and gave IQa-desA-pregnane-S ,20 dione.

EXAMPLE 99 TwentyB-hydroxy-desA-pregn-9-en-5one is prepared from ZOB-hydroxy-IOa-desA-pregnan-S-one by bromination followed by dehydrobromination, according to the precedure of Example 3. The soobtained product, after recrystallization from methylene chloride-petroleum ether, melts at l22-l 23.

EXAMPLE 100 Five,20-dioxo-3,5-seco-A-nor-pregnan-3oic acid is prepared by ozonolysis of progesterone according to the procedure of Example 1.

EXAMPLE 101 Tena-desA-pregna-S,20-dione and IOB-desA-pregnan-S ,20 -dione are prepared from 5,20-dioxo-3,5-seco-A-nor-pregnan- 3-oic acid by conversion of the latter to its sodium salt followed by pyrolysis, according to the procedure of Example 2.

- EXAMPLE 102 The compound, desA-pregn-9-ene-5,20-dione is prepared from lOa-desA-pregna-S,20-dione by bromination followed by dehydrobromination according to the procedure of Example 3. The so-obtained product, after recrystallization from ether, melts at l l ll 13.

EXAMPLE 103 Fifteen ml. of 0.8 percent potassium permanganate solution was added to a mixture of l 1 g. of ZOB-tetrahydropyranyloxypregn-4-en-3-one, 500 ml, of an azeotropic mixture of tertiary butanol and water, 7 g. of potassium carbonate, 20 ml. of water and ml. of 7'percent sodium metaperiodate solution with vigorous stirring at room temperature. Two-hundred and fifty ml. of 7 percent sodium metaperiodate and 20 m1. of 0.8 percent potassium permanganate solution were then simultaneously added within 15 minutes. To the so-obtained suspension, 220 ml. of 7 percent sodium metaperiodate solution and, in order to keep the mixture violet in color, 15 ml. of 0.8 percent potassium permanganate solution were then added in the course of 30 minutes. The mixture was then stirred for 90 minutes, filtered over a filter aid (Hyflo) and the residue was washed with 100 ml. of tert. butanolwater azeotrope. The filtrate was evaporated in vacuo at 50 and the residue diluted with ml. of water. The solution was acidified with cold 20 percent hydrochloric acid to congo red, and the resultant oily material taken up in 150 ml. of methylene chloride. The organic extract was washed with water, dried and evaporated and the residue was purified by filtration over silica gel using methylene chloride and methylene chloride containing 1-2 percent ethanol as the elution agents. There was thus obtained ZOB-tetrahydro-pyranyloxy-5-oxo-3,5-seco-A-nor-pregnan-3-oic acid as a viscous oil.

EXAMPLE 104 To a solution of 35.8 g. of a mixture of 20aand 20B- hydroxy-pregn-4-en-3-one in 500 ml. of anhydrous benzene, there were added 75 ml. of 1 percent p-toluenesulfonic acid in benzene and then 35 ml. of dihydropyran. The reaction mixture was allowed to stand at room temperature for 16 hours, washed with 2 percent aqueous sodium bicarbonate and water, dried and concentrated in vacuo at 11 mm. Hg. and 80. The residue consisting of 20aand 20B- tetrahydropyranyloxy-pregn-4-en-3-one was dissolved in 2 liters of tert. butanol-water azeotrope followed by the addition of a solution of 33 g. of potassium carbonate in 80 ml. of water and 620 ml. of 7 percent aqueous sodium metaperiodate solution. To the reaction mixture there was first added with vigorous stirring at room temperature, 75 ml. of 0.8 percent potassium permanganate and thereafter simultaneously within 30 minutes 1350 ml. of 7 percent sodium metaperiodate solution and 100 ml. of 0.8 percent potassium permanganate solu- 

2. The process of claim 1 wherein said 10-chlorodesA-androstan-5-one is dehydrohalogenated at about 50* C. to about 150* C.
 3. The process of claim 2 wherein said desA-androstan-5-one is chlorinated at from about room temperature to about 40* to 50* C.
 4. The process of claim 2 wherein said 10-chloro-desA-androstan-5-one is dehydrohalogenated in a di-lower-alkylformamide with an alkali metal carbonate or an alkali metal halogenide or is dehydrohalogenated with an organic base.
 5. The process of claim 1 wherein said oxidative ring opening step is carried out by ozonolysis followed by decomposition of the resulting ozonide.
 6. The process of claim 1 wherein said metal salt is formed in situ during said pyrolyzing step.
 7. The process of claim 6 wherein the alkali metal salt is fused with an alkali metal salt of an organic carboxylic acid.
 8. The process of claim 1 wherein said pyrolyzing step is effected in a liquid, basic, nitrogen containing, organic solvent.
 9. The process of claim 8 wherein said desA-androstan-5-one is halogenated in the presence of an organic solvent and a catalyst, said organic solvent being selected from the group consisting of organic acids, ethers, and halogenated hydrocarbons, and said catalyst being selected from the group consisting of hydrogen bromide, acetic acid, and benzoyl peroxide.
 10. The process of claim 3 wherein said 10 epsilon -halo-desA-androstan-5-one is dehydrohalogenated in the presence of an organic solvent and a dehydrohalogenation agent selected from the group consisting of alkali metal carbonates, alkali metal halogenides and organic bases.
 11. A process for the preparation of desA-pregn-9-en-5-ones of the formula:
 12. The process of claim 11 wherein said oxidative ring opening step is carried out by the steps of ozonolysis followed by decomposition of the resulting ozonide.
 13. The process of claim 11 wherein said metal salt is formed in situ during said pyrolyzing step.
 14. The process of claim 13 wherein the alkali metal salt is fused with an alkali metal salt of an organic carboxylic acid.
 15. The process of claim 11 wherein said pyrolyzing step is effected in a liquid basic nitrogen containing organic solvent.
 16. The process of claim 11 wherein the 20-oxo substituent on said desA-pregnan-5-one is protected prior to said halogenation step.
 17. The process of claim 16 wherein said 20-oxo substituent is reduced to a carbinol.
 18. The process of claim 16 wherein said 20-oxo substituent is ketalized.
 19. The process of claim 11 wherein said desA-pregnan-5-one is halogenated in the presence of an organic solvent anD a catalyst, said organic solvent being selected from the group consisting of organic acids, ethers, and halogenated hydro-carbons, and said catalyst being selected from the group consisting of hydrogen bromide, acetic acid, and benzoyl peroxide.
 20. The process of claim 11 wherein said 10 epsilon -halo-desA-pregnan-5-one is dehydrohalogenated in the presence of an organic solvent and a dehydrohalogenation agent selected from the group consisting of alkali metal carbonates, alkali metal halogenides and organic bases.
 21. The process of claim 5 wherein said 10-chloro-desA-pregnan-5-one is dehydrohalogenated at about 50*C. to about 150*C.
 22. The process of claim 21 wherein said desA-pregnan-5-one is chlorinated at from about room temperature to about 40* to 50*C.
 23. The process of claim 21 wherein said 10-chloro-desA-pregnan-5-one is dehydrohalogenated in a di-lower-alkyl-formamide with an alkali metal carbonate or an alkali metal halogenide or is dehydrohalogenated with an organic base. 